have to 和 must 的区别？？

have to 不得不,不是主观愿望
must 一定,必须
I have to go back now.
You must do homework immediately.

前者为一定，后者是必须。
语气上后者要重些

have to:客观上不得不，如You have to buy a tiket when you get on a bus(不买的话售票员会咬你的:))
must：主观上决心一定，如I must study hard！

have to是被动的
must是自己主动的