hi,

why when we need to say 

i don´t have to go we write => gitmem gerekmez (i don´t have to not come)

why we say it that way not come...

and when we need to write:

he doesn´t need to watch why we say seyretmesi gerekmez instead of writing like in the last example seyretmez gerekmez (the r present tense)

thank you.

actually ı dıdnt understand the fırst questıon

benim gitmem gerekmez yada gitmem gerekmez ikisi doğru

gitme = go, m = I, gerek =have to, mez = don´t

he doesn´t need to watch ((Onun) seyretme = watch, si = he, gerek = need to, mez = doesn´t)

Hello!

If you want, you can also say gitmemem (git-me-me-m) gerekir (gerek - (i)r) but it´s not used as much as the other.

And sometimes, they have different meanings too. Gitmem gerekmez means "My going is not necessary." But gitmemem gerekir means "I shouldn´t go (It would be wrong if I did.).

I hope it helps.