Many Turks shorten words by dropping letters in informal conversations to be more fluent or some just being lazy instead of saying the whole word. [but the regional dialects are different matter ] For instance , in future tense sentences that appears as below ;

Correct way --> Geleceğim  ------------> I will come

colloquial [informal, shortened version] ----> Gelecem

                                         or                 Gelcem

Gideceğim ----> Gitcem ---> I will go

Gideceksin ---->Gitcen  ---> You will go

Gidecek   -----> Gitcek ----> He/She will go

Gideceğiz -----> Gitcez ----> We will go

Gidecekler -----> Gitcekler ---> They will go

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Note that  dropping versions are acceptable in Verbal conversations However we cant use it in written language although we see droppings and broken ways in MSN ,chat conversations quite often.

According to consonant harmony a "t" should be followed by a "ç":

Gideceğim ----> Gitçem ---> I will go

Gideceksin ---->Gitçen  ---> You will go

Gidecek   -----> Gitçek ----> He/She will go

Gideceğiz -----> Gitçez ----> We will go

Gidecekler -----> Gitçekler ---> They will go

 You are right Si ++, but sometimes we hear both ways [at least I hear that way] as in ;

Satcak --> He will sell       Satçak --> He will sell

Arabayı satcam ---> I will sell the car.   Arabayı satçam ---> I will sell the car.

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And also we hear with the consonant "d" --> Arabayı sadcam ---> I will sell the car.

                                                             Arabayı sadcaz ---> We will sell the car.

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Again, this is not correct way of saying future tense, however as we mentioned before you can hear people speak this way. My point is , if you hear these forms in future usage, dont be confused as you will know that people refer "future tense" by those.

Colloquial in Present Progressive Tense ; [Note: this form is informal and can be used in only in Verbal conversations]

If we had to make a formula , that would be ;

VERB STEM  +  Iyo [iyo,uyo,üyo] + Personal suffix

   GEL         + İYO  +  M ---> I am coming 

  Buluyosun ---> You are finding

  Yapıyo ---> He/She is doing

  Ne yapıyon ? ---> What are you doing ?

  Çay yapıyom --> I am making tea

  Araba sürüyom ---> I am driving a car.