could have done "本来可以……"(表示过去没有实现的可能)。 might have done "本来可能……;本来应该或可以做某事"(实际没有发生;含有轻微的责备语气。 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...
A. should have taken B. could have taken C. needn't have taken D mustn't have taken 三、虚拟语气和情态动词 (一)要点 真实, otherwise(or) +would have done. must have done , or (otherwise)+ would have done (二)三级试题选编 1、Mr. Green ___ ¬my letter...
第一个:He has made clear the facts. 第二个:He has made clear what they had done yesterday. 在这组例子当中第一句名词the facts做的是句中动词make的宾语。我们来给这个句子变一下形: He has made the facts clear. fact是本句的宾语,clear是对fact的一个补充说...
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...
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