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...
could have done "本来可以做某事实际却没做”或“可能已经做了某事” might have done "或许已经做了某事“ should/ought to have done "本来该做某事而实际未做” should not/ought n...
The National Health Commission said that cultivation of the novel coronavirus and animal infection experiments should be handled in a P3 laboratory — the second-highest biosafety level in a four-tier system — or a laboratory with higher degree of...
15) 过去将来完成时:should have done , would have done 例:I believed by the end of that year an advanced version of that software would have been developed, but I was wrong.(我坚信到那年年底为止,那个软件的新版本将被开发出来。但是我错了。)(此句为被动...
1.should have done =ought to have done 本应该做而没做 2.would have done = 本来就会去做某事而没做 3.could have done = 本可以做某事而没做 4.might have done 本可以做而没做 例:They ought to have apologized. 他们本该道歉的。
更多内容请点击：2023高考英语必背的知识点归纳 推荐文章