16．If you

　　________ smoke, please go outside.

　　17．If you ______ go, at least wait until the storm is over.

　　18．—Shall I inform him of the change of the schedule right now?

　　—I am afraid you ________， in case he comes late for the meeting.

　　19．I ________ (not) worry about my weekend.I always have my plans ready before it comes.

　　20．—Will you read me a story, Mummy?

　　—OK.You________ have one if you go to bed as soon as possible.

　　答案：　2.can't　3.Must　4.might　5.needn't　7.can　8.couldn't/can't　9.mustn't　10.needn't　11.can　12.can　13.can't　14.couldn't　15.might　16.must　17.must　18.must　19.needn't　20.shall二、虚拟语气考点透析虚拟语气在非真实条件句中的用法。

　　时间 if从句动词 主句动词

　　与现在事实相反 did(be改为were) should/would/could/might＋do与过去事实相反 had＋done

　　should/would/could/＋have done

　　与将来事实可能相反 did/should do/were to do should/would/could/might do如：(1)If she were here，everything would be all right.(But she isn't here now.)

　　如果她在这儿一切就好办了。

　　(2)If you had come five minutes earlier，you would have met the famous pop singer.

　　如果你早来五分钟你就可以看见那个著名的流行歌手了。(3)If it were to rain tomorrow，the outing would be canceled.

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