成人高考学位英语备考练习:非谓语动词 一、不定式 (一)基本结构 to do to be doing to have done to be done to have been done 学位英语真题汇编 1、Judging from his manners at the party, he does
been是be的过去分词;done是do的过去分词。常见的用法是have done和have been done,have done是主动形式的现在完成式,have been done是被动式的现在完成式。 1、done的含义及相关短语用法 形容词adj.已完成的;煮熟的;合乎礼仪的;合乎规矩的感叹词表示接受建议)动词·做...
6. 过去完成时(had done) 表示在过去的某个时间或动作以前已经发生的动作或已经存在的状态。就是我们常说的"过去的过去"。 Until then, his family hadn't heard from him for six months. 到那时为止,他家里已经有六个月没得到他的消息了。 7. 过去将来时(would do) ...
By the time I left the school, he had taught the class for 3 years. 到我毕业时,他已经教那个班三年了. 12. 过去完成进行时:had been doing 表示从过去的过去开始,持续到过去的动作...
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