should/ought to have done "本来该做某事"(而实际未做) should not/ought not to have done "本来不该做"(实际却做过了,含有责备语气)needn't have done "本来不必做"(但是已经做过了) would rather have done "当时宁愿做了某事"(实际没有做过);否定式would rather ...
4. They are to be married in this May. (按计划安排要发生的动作,非个人能随意改变) 5. 你妈回来之前你不要出去。(要求或命令他人做某事) You are to stay home until your mother comes back. 6. He is to succeed. (注定) 7. The Queen ___is to___visitJapanin a...
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