He oughtnt to have done that.
他本来就不该做那件事。
2、ought to have + 动词的完成式还可以用来表猜测。
They ought to have arrived by now.
现在他们想必已经到达。
If he had started at nine oclock, he ought to have been in London by eleven oclock.
如果他在九点出发,那他十一点钟该到达伦敦了。
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