To form have to,must sentences the suffix is -meli.
I have to go : Gitmeliyim = Git+meli+y+im.
You have to run : Koş+malı+s+ın
He has to go : Git+meli
We have to say : Söyle+meli+y+iz
You have to do : Yap+malı+s+ınız
They have to drink : İç+meli+ler
This is how you form “have to” sentences try some in the comments…