Words

have to

意为“不得不，很勉强”。后接动词原形。

eg：Bob can not come out to play, because he has to help Dad. 鲍勃不能出来玩，因为他不得不帮助父亲。

小练习：（ ）She____go to bed. Because she will get up early tomorrow. A. have to B. has to C.must

B