摘要:2.should/ought to+have+done在肯定句中表示"该做的事情没有做",在否定句中表示"已做了不该做的事".通常用来表示一种义务.自责或提出委婉的批评. 例如:You should/ought to have come 5 minutes earlier. You shouldn't / ought not to have told her the news. I should have done my homework last night, but I watched TV instead.

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