He has not shown up by now and he might_not_have_caught the train.

　　4．你昨天事故后本来就该给她打电话了。

　　You should_have_called her yesterday after the accident.

　　5．你本来没有必要浇花，因为就要下雨了。

　　You needn't_have_watered the flowers for it is going to rain.

　　6．如果你早点来，你就会见到大明星成龙了。

　　Had you been here earlier you would_have_seen Jacky Chen the famous star.

　　7．他可能及时来到这里，不过我不能肯定。

　　He might get here in time but I can't be sure.

　　8．我要是看见那个广告了，我就申请那份工作了。

　　If I had seen the advertisement I would_have_applied_for the job.

　　9．你走了那么长的路，一定饿了吧。

　　You must_be hungry after your long walk.

　　10．那不可能是玛丽--她住院了。

　　That can't_be Mary - she's in hospital.

　　Ⅲ.单句改错

　　1．-You must go on foot mustn't you?

　　-No I mustn't.

　　第二个mustn't→needn't

　　2．Might that day come soon.

　　Might→May

　　3．If you feel really bad you will talk to the doctor.

　　will→can/should

　　4．He shouldn't have finished the work on time without your help.

　　shouldn't→couldn't

　　5．He must have finished his homework so far mustn't he?

　　mustn't→hasn't

　　6．My son could pass the examination but he wasn't careful enough.

　　pass→have_passed

　　7．If I shall fail next time I would try again.

shall→should