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。
"Always be concerned with what the people are concerned with, love them and let them benefit," Xi ordered. The president said the issues that concern the people most -\- edu...
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