摘要:8.should除表示必要或义务外.还可表示推测或可能.如: The American friends should be here now. “should/ought to+have+过去分词 既可表示本该做而事实上没有做的事.也可以表示惊讶.赞叹等情绪.如:You should have told her about it the day before yesterday. It’s wonderful that you should have achieved so much in these years. “情态动词+have+过去分词 是很重要的一种句型.除should外.may, might, must, couldn’t, needn’t, ought to等都可以用于这一句型.但要注意使用不同的情态动词,句子的意思就有所不同.

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