should/ ought to have done sth 意为“本来应该干……,但未……” shouldn’t/ oughtn’t to + have done sth “本来不应该做……却做了” I wonder why she hasn’t written to us lately. We should have heard from her by now. I ought to have phoned Jack this...
例:She is to be seen in the lab on Monday. 星期一你准会在实验室见到她。 b) 该做或不该做的事情(语气上接近于should, must, ought to, have to),表示一种命令、规劝性语气。 例:You...
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