Could anyone explain when the different forms of <must/have to> can be used,

i mean, in which context do tey occur?

- lazım

- gerek

- -meli/-malı

- mecbur

 lazım, means need to, like tuvalete gitmem lazım / I need to go to the toilet.

gerek is similar, need to, have to...

-meli, malı is more have to... önce okumalısın / first you have to read

-mecbur is must.. Bunu yapmaya mecburum / I must do this

hey this is this weeks lesson lol, heres the lesson :

http://www.turkishclass.com/tl_lesson.php?lesson_id=77

but we dont have mecbur in there

mecbur is arabic BTW lol

and lazim too

And here are some more too

http://www.turkishclass.com/forumTitle_7064_-1