I could have done it if I had wanted to. 如果我那时想做,我能做得到的。
... should have V-ed ...
结构︰主词+should/ought to have+过去分词
说明︰此句型意为原本应当但却未如此。此句型表示没有实现之过去的行为、状态,含有讲话者的责难或遗憾之意。
You should have spoken up in the meeting. 会谈时你实在应该发言(然而你却没有)。
He should at least have come to say good-by. 他至少也该来道个别(然而却没来)。
He ought to have kept his promise. 他原本应该遵守自己的诺言。
You should have been more careful in money matters. 在钱方面,你本当更小心点的。
He ought to have arrived there by now. 他现在应该已经到那里了。
The drama drew a capacity audience; you should have gone to see it.
这出戏吸引了满场观众;你真该去看的。
I should have known better
结构︰主词+should have known better(than to+原形动词)
说明︰此句型意为本来不应该那样笨(而),是指已经做过之事,而 know better(不致那样笨)是指未做之事。
I should have known better. 我本来不应该那样笨。
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