travel all over the world 这里‘travel’是一个及物动词所以不用加‘to‘
travel to the USA 里的‘travel’是
不及物动词,后面必须加一个介词。
情态动词
may:----yes, you must
----no, you can't
must:做推测讲译为“一定”
---yes, he must
---no, he can't
做必须讲译为“必须”
---yes, you must
---no, you needn't
must:
肯定must(必须),否定must not/mustn't/needn't(不准,禁止)He mustn't be there 他一定不在那儿。Mustn't I smoke here? 禁止在这儿吸烟吗?you mustn't smoke here.你不能在这儿吸烟。
注意,must 的否定也有用needn't的。Must I finish the work this morning? Yes,you must/No,you needn't.我必须早上就完成工作吗?是的,必须/不,不需要。
need:
肯定need(需要/必须),否定needn't. You need not go yet , need you? Yes, I must/ I need to/ I have to/No, I needn't或者 No,I don't have to.你不一定要去,是吗?是的,我一定要/必须/不得不去/不,不一定要去。
shall(只和
第一人称连用 we/I):
肯定shall(将/必将/可以/。。。好吗),否定 shall not. 注意,当回答中主语不再是第一人称,Shall要变成should.Shall I go to school? Good idea/Yes,you should./No,you shouldn't.但是回答主语仍旧是第一人称时,shall 不用变。Shall we go to school? Yes, we shall/No, we shall not/I'd love to, but I can't.
may:
肯定may(可以/许可/能),否定may not.注意过去式,
虚拟语气或客气是用might/mightn't.May I close the window? Yes, go ahead/Yes, you can(一般不这么说)/No, I'm afraid you may not。