unit 2 第二课时
ⅰ.语法填空
1．—i didn't go to work yesterday because my car broke down.
—you ________have borrowed mine. i wasn't using it then.
答案：could 考查情态动词＋have done。句意：——由于我的车坏了，昨天我没有去上班。——你本来能够用我的车，当时我并不用车。事情发生在过去，could have done本来能够做……，暗含实际上没有做。
2．sometimes his present job________ be boring, and he has to work for long hours a day.
答案：can 句意：有时他现在的工作有可能很没趣，并且他一天中还必须工作很长时间。can表示事情一时的可能性。
3．we are given a special holiday, so we ________ go to work tomorrow.
答案：needn't 句意：我们有个特别的假期，所以我们明天不必去上班。needn't不必；shouldn't不应该。
4．—sorry, professor smith. i didn't finish the paper yesterday.
—oh, you ________ have done it as yesterday was the deadline.
答案：should 答语句意：哦，你本该做完的，因为昨天就是最后期限。此处用should have done表示本该做某事而实际上未做。
5．—what do you think we can do for our aged parents?
—you ________ do anything except to be with them and be yourself.
答案：needn't 句意：——你认为我们能为我们年老的父母做什么？——除了陪伴他们及顺其自然你不必做任何事。needn't＝don't have to不必。
6．—i didn't see her last night at the party.
—you ________ have. but you came too late.
答案：could 句意：——我昨天晚上在聚会上没见到她。——你本能见到她的。但是你来得太晚了。此题考查could have done，过去分词已省去。could have done表示“过去本来可以做某事，但实际上没有做”。
7．—must i return the book a week later?
—oh, no.you ________.
答案：needn't 句意：——我必须一周后还这本书吗？——哦，不，不必。must的疑问句的否定回答用needn't或don't have to。
8．—she looks unhappy.________ anything have happened to her?
—i'm not sure, but i guess something may ________ (happen)．
答案：can; have happened 句意：——她看起来不高兴。她可能出了什么事吗？——我不确定，但我想可能出了什么事。can have done可能做了某事，用于疑问句或否定句；may have done可能做了某事，表示把握较小的推测，用于肯定句。
9．(2013•辽宁
高考改编)harry is feeling uncomfortable.he ________(drink) too much at the party last night.
