when it comes to human rights, considering what the US has done historically and currently, its officials are in no position to wantonly criticize China. I wish we could ma...
除ought, used, have后跟不定式外,其他情态动词一律跟动词原形。情态动词主要有:can/could, may/might, must, ought to, used to, need, dare, shall/should, will/would, have to等。 ...
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。 5. must have done sth 一定做过某事 否定形式:can't / couldn’t have done ...
情态动词+不定式完成式(have done) 1) can / could + have done在肯定句中表示“本来可以做而实际上能做某事”,是虚拟语气;在疑问句或否定句中表示对过去行为的怀 疑或不肯定, 表示推测。1. You could have done better, but you didn’t try your best.(虚拟语气)2...
2) 情态动词 除ought 和have 外,后面只能接不带to 的不定式。 3) 情态动词没有人称,数的变化,即情态动词第三人称单数不加-s。 4) 情态动词没有非谓语形式,即没有不定式,分词,等形式。 比较can 和be able to 1)can could 表示能力;可能(过去时用could), 只用于现在式和...
更多内容请点击：「双语」例行记者会/Regular Press Conference(2021-5-13)