文档介绍：情态动词(modal verbs)
情态动词(modal verbs)
情态动词短语
phrases of modal verbs
现在式(present tense)
过去式(past tense)
can
could
be able to
may
might
be allowed to
must
--------
have to
shall
should
be supposed to (ought to)
will
would
be going to
Would you plaining about things? We’re supposed to do our best and we should be able to finish this work before the boss has to start screaming at us again. If you could just concentrate on getting finished, we might be allowed to leave early this afternoon. You know he’s not going to let us leave early if we can’t get the work done.
:表示能力,过去、现在无论何时的能力。(Ability)
I can speak English. 我能说英语。
:人们现在决定将来的可能性(possibility)
We can talk about it later. 我们可以稍后讨论。
:表达理论上的可能性,事件或情况可能发生但不涉及是否真的发生。有时指一时的情况,常常译为“有时候会”
It can be very hot in North China in summer. 夏季华北地区会很热。
:否定句和疑问句中,表示惊异、怀疑、不相信。
How can that be true? I can’t believe it. 那怎么可能是真的?我真不敢相信。
have done表示对过去发生事情的推测,主要用于疑问句和否定句中。(supposition)
Mary can’t have gone to school, as it was Sunday.
(permission)
Can I watch TV for a while, Mum? I have been studying for a whole day.
。
Could I use your cellphone for a while?
-Yes, you can.
,语气较强。(suggestion)
Can you make some room for me, please?
你能否为我腾出一点地方来?
二、could
:can的过去式,表示能力
I couldn’t speak well until I was five years old.
我直到5岁才说话流利。
:否定句和疑问