20 August 2014

Arabic Verbal Form I (i) fa'ila فَعِلَ يَفْعَلُ يَفْعِلُ yaf'alu yaf'ilu fa3ila

Meaning shades of Arabic Verbal Form I (i)

Also see posts on Other Arabic Verb Forms
This post is on The Meanings of Arabic Verb Form I (i)  فَعِلَ, Usually one or multiple (more than one) of the following meaning shades are applicable in a form I (i) verb and applicable meaning shades may differ from verb to verb.
Last edited on : 22-August-2014 and planned to be edited and improved further.

فَعِلَ
i-a =  فَعِلَ i-a يَفْعَلُ
i-i = فَعِلَ i-i يَفْعِلُ

1 (w) . Mostly Intransitive, sometimes transitive. When intransitive, mostly indicates a temporary state or condition, or a merely accidental quality in persons or things.

2 (t) . Generally a stative structure. Rather than indicating real actions that occur over time, this structure usually refers to the state of the subject. These verbs usually do not indicate real actions. You don't actually do something when you "know". The stative verb "to know" can indicate 2 things:
It can indicate the simple being in the state of knowing.
It can indicate the becoming in the state of knowing; or in other words, it can indicate changing from the state of unknowing into the state of knowing.
Thus, stative verbs can indicate either being something or becoming something.
Most of the stative فَعِلَ verbs will primarily indicate the 2nd meaning, i.e. "he became something." A few number of them ill indicate "he was something" as a primary meaning.
The dynamic vs stative distinction between فَعَلَ and فَعِلَ is a general rule but is not always true. Sometimes inverse is also true.

3 (h)(n) . The general rule when perfect is فَعِلَ is that imperfect is mostly يَفْعَلُ (i-a) but when ف of root is و , then يَفْعِلُ (i-i) is mostly used so that cause of elision of و is there i.e. و when quiescent is deemed heavy between a ي pronounced with fatha and an inseparable kasra and is elided/dropped. Very few verbs have rare usage of form فَعِلَ i-i يَفْعِلُ in addition to more common and approved usage of form فَعِلَ i-a يَفْعَلُ without ف of root being a و but on deeper examination usage of i-i in them does not appear to be justified. Some verbs have form فَعِلَ i-a يَفْعَلُ despite ف of root being a و .

س The form فَعِلَ i-a يَفْعَلُ also known as form سَمِعَ
In such verbs, one or multiple from the following meaning shades may be applicable.

Important meaning shades:
(k) . Mostly 8 types of verbs come from i-a and can be used for indicating:

1 (k)(a) . Ailment, sickness, illness, disease; pain, ache etc.
سَقِمَ He became ill.
مَرِضَ He became sick. He had a disease.
وَجِعَ He had pain or ache.
أَلِمَ He suffered severe pain or ache.
شَكِعَ He went into a state of groaning with pain or illness. He was groaning with pain or illness.

2 (k)(a) . Grief, sorrow, sadness etc.
حَزِنَ He became affected with حُزْن (Past related worry. Roughness or uneasiness in the spirit on account of grief. Grief, sorrow, sadness. Grief arising on account of an unpleasant event that has happened, or on account of an object of love that has passed away.
خَزِيَ He became humiliated, disgraced, abased to the level of being ashamed of his state himself. 

3 (k)(a) . Gladness, joy, happiness, rejoicing etc.
فَرِحَ He experienced a sensation of lightness in his heart. He experienced dilation of his chest with delight or pleasure. This experience is usually of short duration, transitory and fleeting. He exulted or rejoiced: beyond due level or ungratefully or proudly.

4 (k)(a) . Colors. (Mostly Form IX and Form XI are used to indicate colors.)
شَهِبَ It was or became of the color termed شُهْبَة (grey, whiteness mixed with blackness.)
قَهِبَ It was or became of the color termed قُهْبَة (an ashy dust color or dusky white color etc.)
أَدِمَ He was or became of the color termed أُدْمَة ( wheatish)

5 (k)(a) . Defect, blemish, fault, faultiness, unsoundness, imperfection, something amiss etc.
شَكِسَ He became ill-natured in behavior or dealing.
لَحِزَ He became miserly.

6 (k)(a) . Condition, state, form, make, appearance, quality, attribute; aggregate of the attributes or qualities etc.
The examples below are also valid for defects point above.
ضَلِعَ It was or became crooked or curved. .
عَرِجَ He became lame.
عِوِرَ He became one eyed. He became blind of one eye.

7 (k)(a) Inflaming with anger; flaring, emotion, incitement, excitement, amazement, astonishment, agitation, restlessness, anxiety, fear etc.  
بَطِرَ He exulted and behaved insolently, ungratefully, thanklessly due to wealth.
قَلِقَ He became restless.
حَمِسَ He became hardy.
غَضِبَ He became angry.

8 (k)(a) . Hunger, thirst etc.
شَبِعَ He became sated or satiated, or satisfied in stomach after eating ample food. 
رَوِيَ He drank to satisfaction, he drank to his fill, he quenched his thirst. He drank enough to satisfy or quench his thirst.  
عَطِشَ He became thirsty.

9 (k) .  Mostly verbs like above 8 categories and verbs indicating change of state or condition come from i-a . In perfect of this form, ع of root is given kasra instead of fatha, i.e. perfect is فَعِلَ instead of فَعَلَ , as if in word and meaning there is change from 1 state or condition to another.

10 (k)(a) . Becoming  scared, afraid , confounded, stupefied, astonished, amazed on seeing the thing indicated in the word from the same root.
أَسِدَ He became stupefied by fear on seeing a lion i.e أَسَد 
بَقِرَ It (a dog) became confounded, stupefied, astonished on seeing بَقَر (wild oxen or wild bulls or cows).

11 (q) . This form is indicative of internal : states, conditions, emotions etc. 

Other meaning shades:
Following meaning shades are also possible in few verbs from i-a.

12 (k) . Attaching or gluing to the thing indicated in the word from the same root.

13 (k) . Becoming like the thing indicated in the word from the same root.

14 (k) . Becoming possessor of the meaning indicated in the root or thing indicated in the word from the same root. 
تَرِبَ It became dusty.
تَرِبَ he or it became affected with جَرَب  (mange or scab) . 

15 (k) . To indicate the subject or فَاعِل making the object or مَفْعُول to become possessed of the meaning indicated by the root or word from the same root. 

16 (k) . Subject or فَاعِل Removing from the object or مَفْعُول the meaning indicated by the root or thing indicated by the word from the same root .

Note: 
(k)(n)(a) . Some verbs come on both forms فَعِلَ i-a يَفْعَلُ and فَعُلَ u-u يَفْعُلُ . Verbs that have ي as عor ل of root don't come on form فَعُلَ u-u يَفْعُلُ except extremely few verbs presented by some as exceptions e.g. هَيُؤَ and these 2 with final ي converted to و as رَمُوَ and قَضُوَ  . Meaning shade is different, i-a usually indicating a temporary state or condition while u-u a permanent state or condition. Some books translate both verbs with same explanation but differences should be kept in mind and indicated in translation after also considering context in which each of the 2 forms is used.  

ح The form فَعِلَ i-i يَفْعِلُ also known as form حَسِبَ
1 (h) . The general rule when perfect is فَعِلَ is that imperfect is mostly يَفْعَلُ (i-a) but when ف of root is و , then يَفْعِلُ (i-i) is mostly used so that cause of elision of و is there i.e. و when quiescent is deemed heavy between a ي pronounced with fatha and an inseparable kasra and is elided/dropped. Very few verbs have rare usage of form فَعِلَ i-i يَفْعِلُ in addition to more common and approved usage of form فَعِلَ i-a يَفْعَلُ without ف of root being a و but on deeper examination usage of i-i in them does not appear to be justified. Some verbs have form فَعِلَ i-a يَفْعَلُ despite ف of root being a و . So فَعِلَ i-i يَفْعِلُ is not an original form and is converted from فَعِلَ i-a يَفْعَلُ due to above mentioned reason. Its meaning shades don't have to be discussed since same meaning shades of i-a hold for i-i also. 

2 (k)(n). All verbs that come on form i-i in The Qur'an have و as  ف of root, even حَسِبَ is used in the Qur'an on form i-a and not i-i . Following verbs are said in some books to come from i-i without ف of root being و
حَسِبَ , but it is used in the Qur'an on form i-a only and not even once on form i-i. More approved and used form is i-a and only 1 tribe has i-i dialect also.
بَئِسَ , its contracted form بِئْسَ is used in the Qur'an. Again no i-i usage in the Qur'an. Also in Lane Lexicon, only i-a is mentioned and no i-i and the claim or usage of i-i if any seems strange since ع of root is a guttural letter and such usually get fatha on ع of root in imperfect , then how is form i-i being claimed in addition to i-a?
نَسِيَ , but it is used in the Qur'an on form i-a only and not even once on form i-i.
نَعِمَ , its contracted form نِعْمَ is used in the Qur'an. Again no i-i usage in the Qur'an.
The claim or usage of i-i if any seems strange since ع of root is a guttural letter and such usually get fatha on ع of root in imperfect , then how is form i-i being claimed in addition to i-a?
يَبِسَ , neither i-a nor i-i used in the Qur'an.
 i-a is the more approved and used form and usage of i-i is extraordinary with respect to rules and usage. Though, I have discussed in I(a), the imperfect coming on a-i due to of ف root being a ي as a possible reason of it coming on form a-i and so here in I(i) also, this can be a rare and seldom used reason of coming on form i-i in addition to the approved form i-a in such cases.
يَئِسَ , but it is used in the Qur'an on form i-a only and not even once on form i-i.
i-a is the more approved and used form and usage of i-i is extraordinary with respect to rules and usage. The claim or usage of i-i if any seems strange since ع of root is a guttural letter and such usually get fatha on ع of root in imperfect , then how is form i-i being claimed in addition to i-a?

Important Note: 
Best examples for analyzing and verifying the level of applicability or non-applicability of above mentioned meaning shades and for finding additional meaning shades is by studying all occurrences of the form in The Qur'an and for that you can check relevant examples for this form in Pattern Wise Concordance PDF by visiting the post:  
Pattern wise, Root wise & Letter wise Concordance of The Qur'an
& downloading the concordance documents freely. You can check relevant examples of most of the patterns used in the Qur'an by using concordance documents.

References: When multiple references mentioned for a point, it means material selected from all quoted references more from some and less from others and all quoted references do not necessarily agree on everything. Material is not exactly copied but based on the reference quoted and I have made additions, editions & changes where required :   
k = Aasaan Khaasiyyaat e abwaab Urdu
h = Howell Arabic Grammar English
w = Wright Arabic Grammar English
t = arabic.tripod.com
q = Qawaid Zaban e Qur'an Urdu
n = new indication by me.
a = Derived from other tools like arabic almanac or some other book.

15 August 2014

Arabic Verb Form I (a) فَعَلَ يَفْعُلُ يَفْعِلُ يَفْعَلُ fa'ala yaf'ulu yaf'ilu yaf'alu fa3ala

Meaning shades of Arabic Verbal Form I (a)
Also see posts on Other Arabic Verb Forms
This post is on The Meanings of Arabic Verb Form I (a) فَعَلَ . Usually one or multiple (more than one) of the following meaning shades are applicable in a form I (a) verb and applicable meaning shades may differ from verb to verb.
Last edited on : 15-August-2014 and planned to be edited and improved further.

 فَعَلَ
a-u = فَعَلَ a-u يَفْعُلُ
a-i = فَعَلَ a-i يَفْعِلُ
a-a = فَعَلَ a-a يَفْعَلُ

1 (w) .  Mostly transitive, sometimes intransitive.

2 (t) . Generally a dynamic or active structure. It usually indicates a real action on the part of the subject that occurs over a period of time.

3 (h) . Generally the imperfect of فَعَلَ is يَفْعِلُ (a-i) or يَفْعُلُ (a-u) unless ع or ل of root is a guttural letter i.e. 1 of  أ ، ه ، ع ، ح ، غ ، خ in which case the imperfect can also come on يَفْعَلُ (a-a). Various فَعَلَ verbs have both imperfects i.e. يَفْعِلُ (a-i) or يَفْعُلُ (a-u) .

4 (h) . The verb indicative of superiority usually has فَعَلَ a-u يَفْعُلُ , but not all verbs of a-u are indicative of superiority and have other meaning shades also.

5 (h). The form فَعَلَ a-i يَفْعِلُ comes when ف of root is و or ي . Damma is discarded because a ي followed by a و or ي before a damma is deemed heavy. If it is و then it is usually dropped since it is deemed heavy when it is quiescent and is between a ي pronounced with fatha and inseparable kasra. (This can be originally a-i or a-u. )

6 (h) . The form فَعَلَ a-i يَفْعِلُ comes when ع or ل of root is ي , but if one of  ع or ل is ي and other one of ع or ل is a guttural letter, then in such cases it can also come on the form فَعَلَ a-a يَفْعَلُ  . (This can be originally a-i or a-u)

7 (h) . For roots with same letter as  ع and ل of root i.e. reduplicated verbs ,  فَعَلَ a-i يَفْعِلُ mostly comes for intransitive verbs e.g. خَرَّ يَخِرُّ and very rarely for transitive verbs.

8 (h) . For roots with same letter as  ع and ل of root i.e. reduplicated verbs ,  فَعَلَ a-u يَفْعُلُ mostly comes for transitive verbs , and sometimes for intransitive verbs .

9 (h) . The form فَعَلَ a-u يَفْعُلُ comes when ع or ل of root is و , but if ل of root is و and ع of root is a guttural letter in which case it can also come on the form فَعَلَ a-a يَفْعَلُ  . (This can be originally a-u or a-i)

10 (h) .  The form فَعَلَ a-u يَفْعُلُ comes when the verb is indicative of superiority to the competitor but if ف of root is a و or if ع or ل of root is ي , then the form is  فَعَلَ a-i يَفْعِلُ . (Such verbs are originally a-u)

11 (h) . The form فَعَلَ a-a يَفْعَلُ usually comes when the verb in not indicative of superiority to the competitor and ع or ل of root is a guttural letter , and root is not with same letter as  ع and ل i.e. it is not a reduplicated verb and verb is not a verb which is well known for its usage in form فَعَلَ a-i يَفْعِلُ or فَعَلَ a-u يَفْعُلُ .The guttural letter makes form a-a allowable, but not necessary.
Extremely few exceptions exist in which form فَعَلَ a-a يَفْعَلُ is used even when ع or ل of root is not a guttural letter e.g. أَبَىٰ يَأْبَىٰ etc. Some possible reasons can be there via which some of the exceptions can be shown to still follow the rule. Some say that بَقَىٰ يَبْقىٰ is originally بَقِىَ يَبْقىٰ because every final ى pronounced with uninflectional fatha and preceded by kasra, can be converted into ا or ى (which is is written ى but spoken like ا and is called ألف مقصورة .) and then kasra on its previous letter is also converted to fatha. Very rarely, perfect of 1 form is used while imperfect of other form is used. Also very rarely, an inter-mixture of 2 dialectic variants is used in which perfect is taken from 1 form while imperfect is taken from the other form.

Important Note: 
Below, I give meaning shades of the sub forms a-u, a-i mostly based on (k) and since other books I have didn't contain much information , I couldn't cross check and re-verify the suggested meaning shades using other books. Moreover, the book has quoted 1 example with most of the shades and it can't be ascertained without an exhaustive study into many such verbs from each sub form the number of verbs on which each of the given meaning shades apply. So just read them few times and if you can keep in mind easily you can, but no need to memorize below meaning shades of form I (a).  

ن The form فَعَلَ a-u يَفْعُلُ also known as form  نَصَرَ
In such verbs, one or multiple from the following meaning shades may be applicable.

Important meaning shades:
1 (h)(k)(a) . Indicative of superiority to the competitor . Showing the superiority, surpassing, overpowering, predominating, gaining of ascendancy, victory, overcoming, prevailing of 1 competitor over the other. After form III verb indicating reciprocity or mutual effort or competition, form I (a-u) is usually used to show the gaining of superiority of 1 over the other. An important point to note is that we can't choose any verb we like in a-u and use it to show superiority to the competitor, but this is only for those verbs which are used in Arabic in this sense . 
If ف of root is a و or ي OR if ع or ل of root is ي , then the form used is  فَعَلَ a-i يَفْعِلُ . It appears that such verbs are originally a-u but due to 1 of these 2 reasons the form is converted to a-i . Specially form I forms indicative of superiority appear to be originally a-u, which are sometimes converted to form a-i when one of these conditions is met. Note: This quality won't be discussed again in a-i even if it comes from a-i when 1 of above mentioned conditions is met, because it appears that in such cases also it is originally a-u which is converted to a-i. 
 كَبَرْتُهُI became bigger than him.

2 (a-u, a-i) (k) . To indicate the subject or فَاعِل making the object or مَفْعُول to become possessed of the meaning indicated by the root or word from the same root.
 ثَلَثَ الْمَالَHe made 3 portions of the wealth. (derived from the word ثُلُث from the same root  ث ل ث .)

3 (a-u, a-i) (k) . To indicate the subject or فَاعِل reaching the place or time indicated by the word from the same root.

Other meaning shades:
4 (k) . Possessing the meaning indicated by the root or thing indicated by the word from the same root.
 بَابَ لَهُHe was or became a keeper of بَاب i.e. door keeper for him.

5 (k) . Doing something in the time indicated by the word from the same root.
 غَدَاHe went or went away in the time called غُدْوَة (the early part of the morning).  

6 (k) . Making the thing indicated by the word from the same root.
 جَدَرَHe made a جِدَار i.e. wall.

7 (k) . Using the thing indicated by the word from the same root. Doing with the thing indicated by the word from the same root, the function it is made for. 
 عَصَاهُHe struck or beat him with a عَصَا i.e. staff. (He used a عَصَا i.e. staff. to strike him.)

8 (k) . Taking from something what is indicated by its root or indicated by a word from its root.
 ثَلَثَ الْمَالَHe took 3rd portion of the wealth.

9 (k)(a) .  Thrusting, propelling, pushing or repelling the thing indicated by the word from the same root, to remove it from its place .
 بَصَقَHe spat. (بُصَاق means spittle or saliva that has gone forth from the mouth)

10 (k) . Subject or فَاعِل joining or mixing something with the object or مَفْعُول .
مَشَجَ بَيْنَهُمَا He made a mix up or confusion between them 2. 
مَزَجَهُ بِالْمَآء He mixed, mingled, blended it with water.

11 (k) . Subject or فَاعِل veiling, covering the object or مَفْعُول .
حَجَبَهُ He veiled it. 

12 (k) . Verbs indicating gathering together or collecting together or assembling together often come on form a-u.
حَشَرَهُم He assembled them together.

13 (q) . This form has verbs indicating the act of advancing or expansion, spreading etc.  and related meaning shades.

14 (a-u, a-i) (k) . Preventing something from the meaning indicated by the root of the verb or word from the same root as the verb.

15 (a-i, a-u) (k) .Giving the thing indicated in the word from the same root.
 أَجَرَهُHe gave him أَجْر (a recompense, compensation or reward for what one has done).

16 (a-i, a-u) (k) . Feeding someone with the thing indicated in the word from the same root.
تَمَرَهُ (a-i, a-u) he fed him تَمْر (dates.)
17 (a-i, a-u) (k)(a) .Subject or فَاعِل Removing from the object or مَفْعُول the meaning indicated by the root or thing indicated by the word from the same root .
(This appears to be more common in a-i as compared to a-u based on (k). In examples like below one, both a-i and a-u forms can be used.)
 قَشَرَهُ(a-i) & (a-u) both used in similar meaning. He removed or stripped off from it (e.g. branch or some other thing) the قِشْر (outer covering, superficial part, outer integument, peal, rind, bark, coat, covering, skin, crust etc.)


ض The form فَعَلَ a-i يَفْعِلُ also known as form  ضَرَبَ
In such verbs, one or multiple from the following meaning shades may be applicable.

Important meaning shades:
1 (a-i, a-u) (k)(a) .Subject or فَاعِل Removing from the object or مَفْعُول the meaning indicated by the root or thing indicated by the word from the same root .
(This appears to be more common in a-i as compared to a-u based on (k). In examples like below one, both a-i and a-u forms can be used.)
 قَشَرَهُ(a-i) & (a-u) both used in similar meaning. He removed or stripped off from it (e.g. branch or some other thing) the قِشْر (outer covering, superficial part, outer integument, peal, rind, bark, coat, covering, skin, crust etc.)

2 (k) . To shorten a sentence into 1 verb by making the verb from root of 1 word of the sentence.

3 (q) . Movement from above to below.

Other Meaning Shades:
4 (k) . Becoming the thing indicated in the word from the same root or becoming like the thing indicated in the word from the same root.

5 (k) . Making something reach the thing indicated by the word from the same root as that of the verb.
 جَلَدَهُ بِالسَّوْطHe hit his جِلْد i.e. skin with a whip. (He caused the whip to reach his skin.)

6 (k) . Subject or فَاعِل making separations or divisions or distinctions in the object or مَفْعُول .
قَسَمَهُ He made divisions of it.
فَصَلَهُ He made separations or distinctions in it.

7 (k) . Cutting the thing indicated by the word from the same root.
خَلَى He cut the  خَلًى (fresh, green or juicy herbage) .

8 (k) .  Settling or staying in some place.
ثَوَى فِيهِ He stayed or dwelt in it.
قَرَّ فِيهِ He settled or remained in it. 

9 (k) . Correcting or mending something.

10 (k) . Verbs having sense of throwing.
رَمَى He threw.

11 (k) . Verbs related to sound or speaking.
نَطَقَ He spoke.

12 (k) . Clothing or covering with the thing indicated in the word from the same root. 

13 (k) . Joining or plastering or coating something with the thing indicated in the word from the same root.
طَانَهُ he plastered or coated it with طِين (clay or mud, soil that has been mixed with water.)

14 (a-u, a-i) (k) . To indicate the subject or فَاعِل reaching the place or time indicated by the word from the same root.
(This appears to be more common in a-u as compared to a-i based on (k) and example provided in (k) for a-i has  ف of root as ي and it can also be a reason of converting form to a-i or it may also be originally a-i.)
يَمَنَ He came on right side.

15 (a-u, a-i) (k) .  Preventing something from the meaning indicated by the root of the verb or word from the same root as the verb.

16 (a-u, a-i) (k) . Collecting together or gathering together something. Appears to be more common in a-u as compared to a-i.

17 (a-i, a-u) (k)  .Giving the thing indicated in the word from the same root.

18 (a-i, a-u) (k) . Feeding someone with the thing indicated in the word from the same root.
خَبَزَهُ (a-i) he fed him خُبْز (bread.)
تَمَرَهُ (a-i, a-u) he fed him تَمْر (dates.)

19 (a-u, a-i) (k) . To indicate the subject or فَاعِل making the object or مَفْعُول to become possessed of the meaning indicated by the root or word from the same root.

20 (k)(n) . To indicate a place becoming grassy or herby. (k) discusses this point as muchness of the thing indicated in the source word or root, but both examples quoted in form I in it relate to grass or herbs only. To me it seems to indicate the possessing or being possessed of the thing indicated in the root or word from the same root, as muchness is not a quality of form I.


Some other Possible meaning shades of form I (a)
1 (k) . Subject or فَاعِل  becoming the thing indicated in the word from the same root.

2 (k) . Subject or فَاعِل making the object or مَفْعُول to become the thing indicated in the word from the same root. 

3 (k) . Subject or فَاعِل  breaking the thing indicated in the word from the same root.    

4 (k) . Verbs having sense of giving pain.

5 (k) . Giving something in return for another.

6 (k) . Going or traveling.


ف The form فَعَلَ a-a يَفْعَلُ also known as form  فَتَحَ
1 . This form is mostly derived from a-i or a-u because of occurrence of a guttural letter i.e. any of the following letters أ ، ه ، ع ، ح ، غ ، خ as  ع or ل of root and may have any of the meaning shades discussed above for a-i or a-u.

2 (h) . The form فَعَلَ a-a يَفْعَلُ usually comes when the verb in not indicative of superiority to the competitor and ع or ل of root is a guttural letter , and root is not with same letter as  ع and ل i.e. it is not a reduplicated verb and verb is not a verb which is well known for its usage in form فَعَلَ a-i يَفْعِلُ or فَعَلَ a-u يَفْعُلُ .The guttural letter makes form a-a allowable, but not necessary.
Extremely few exceptions exist in which form فَعَلَ a-a يَفْعَلُ is used even when ع or ل of root is not a guttural letter e.g. أَبَىٰ يَأْبَىٰ etc. Some possible reasons can be there via which some of the exceptions can be shown to still follow the rule. Some say that بَقَىٰ يَبْقىٰ is originally بَقِىَ يَبْقىٰ because every final ى pronounced with uninflectional fatha and preceded by kasra, can be converted into ا or ى (which is is written ى but spoken like ا and is called ألف مقصورة .) and then kasra on its previous letter is also converted to fatha. Very rarely, perfect of 1 form is used while imperfect of other form is used. Also very rarely, an inter-mixture of 2 dialectic variants is used in which perfect is taken from 1 form while imperfect is taken from the other form.

3 (q) .  This has not been accepted as a baab or form in the real sense and has been made for convenience for roots in which letters أ ، ه ، ع ، ح ، غ ، خ come as  ع or ل of root. But is not necessary that each verb meeting this condition comes on form a-a and may come on other forms also.

4 (k)(h) . Fatha is lighter than kasra and kasra is lighter than damma. So fatha is the lightest of the short vowels. The guttural letters are pronounced from throat and are heavy. Also, the more the number of letters in a word, the heavier the word. Putting fatha instead of damma or kasra lightens the word to some extent.

5 (h)(k) . When same guttural letter comes as  ع or ل of root and the verb is reduplicated, almost always it comes on form a-u or a-i and not a-a.


Important Note: 
Various meaning shades overlap exists between a-u , a-i and a-a i.e. some meaning shades are common for more than 1 form, though the meaning shade may be more common or more applicable in 1 form as compared to the other. Also, the possible meaning shades for form I are many due to which many books don't explain them at all or just touch some meaning shade. All 3 i.e. a-u, a-i and a-a have perfect on pattern فَعَلَ . And as discussed at the beginning, some letters coming in various positions of root also cause certain form of imperfect to come and certain form of imperfect to not come. In addition to that sometimes there are more than one dialectic variants for same verb, as a significant number of verbs are assigned form a-u and a-i at the same time. This implies that a number of meaning shades may be common in both forms. And a-a also is a form just because of a guttural letter coming and is originally a-u or a-i and has meaning shade of a-u or a-i or some meaning shade common between a-u and a-i. In short, all meaning shades discussed in this post are meaning shades when perfect comes on pattern فَعَلَ and should be kept in mind for simplicity. Also since this is form I this also helps us understand in what shades an Arabic verb can be used, as it is not only doing the thing indicated in root but there are various kinds and ways of doing and this can broaden our perspective on Arabic verbs.    

Important Note: 
Best examples for analyzing and verifying the level of applicability or non-applicability of above mentioned meaning shades and for finding additional meaning shades is by studying all occurrences of the form in The Qur'an and for that you can check relevant examples for this form in Pattern Wise Concordance PDF by visiting the post:
Pattern wise, Root wise & Letter wise Concordance of The Qur'an
& downloading the concordance documents freely. You can check relevant examples of most of the patterns used in the Qur'an by using concordance documents.

References: When multiple references mentioned for a point, it means material selected from all quoted references more from some and less from others and all quoted references do not necessarily agree on everything. Material is not exactly copied but based on the reference quoted and I have made additions, editions & changes where required :   
k = Aasaan Khaasiyyaat e abwaab Urdu
h = Howell Arabic Grammar English
w = Wright Arabic Grammar English
t = arabic.tripod.com
q = Qawaid Zaban e Qur'an Urdu
n = new indication by me.
a = Derived from other tools like arabic almanac or some other book.