Now I know why are you so stubborn on your claim Si++, its because I mishighlighted the suffixes ; the right way should be as follows ;

Korkmak = to fear -----> Kork-ak ----> coward

Dilemek = to wish -----> Dile-k -------> wish

Kapamak = to close ----> Kapa-k -----> lid, cover

Yatmak = to sleep ------> Yat-ak -----> bed

this will end the debate i guess..you cant be still oppose ?

 I am not relying on one grammer book as you do. Seems like you are mixing apples with pears. Its quite simple , I am suprised that you are having trouble understanding it.

Dilemek = to wish

Dile [verb stem]

Dile + k [wish]----> only -k comes because the stem verb ends with VOWEL !

thats so simple..

note that I am not adding -ke , i am adding only -k !

 No, It is not applicable to all verbs. [unfortunately]

The suffix -gan [-gen,-kan,-ken ]

This suffix make some verbs adjectives.

FORMULA ;

VERB STEM +  -gan [-gen,-kan,-ken ]

saldırmak = to attack -----> saldırgan [agressive, offensive]

sürünmek = to creep, to crawl ----> sürüngen [ reptant,creepy ]

iletmek = to pass ----> iletken [ conductive ]

yapışmak = to stick, to adhere ----> yapışkan [sticky,adhesive ]

 Yep ! Yep ! Yep !

we are saying the same things...of course  -[e]k and [i]k, [ı]k, [u]k, [ü]k are listed seperately however -k [-[a]k,-[e]k] are same in that respect [its all to do with verb stem ending with vowel or consonant ]

Rica ederim.

the suffixes "ık,ik,uk,ük "  make verb stems into more like adjectives

bitmek = to finish    ----> bitik [exhausted,worn out]

yanmak = to burn   -----> yanık [ burnt ]

solmak = to fade  ------> soluk [ faded,pale ]

 -k comes when the verb stem ends with vowel [ Dile + k ]

-ak,ek comes when the verb stem ends with consonant [ Yat + ak, dön + ek ]

therefore they are same.

the suffixes "ık,ik,uk,ük "  are bit different, they make verb stem into more like adjectives.

Bileşik zamanlı formlar ve "ol" yardımcı fiili ;

[ Compound tense forms and the auxiliary "ol-" ]

Git   -    miş                  ol -  acağ  -   ız      ---> Gitmiş olacağız

Go   - informed past   be - Future  - person [we]

We   will   have gone

 ****************************************

Dinlen  -- iyor                   ol  -- malı  --- sınız   ---> Dinleniyor olmalısınız.

Rest   -- Cont.Tense      be -- neces. -- you [plural]

You must be resting.

****************************************

Bitir ---- miş                   ol ---- ur -------    sun  ------> Bitirmiş olursun.

Finish -- informed past     be ---Aorist tense-- Person [you]

You´ll have finished.