④ be have和do作助动词使用时,需要带分词或不定式,但在答句或评语等中常省略。 如:—Have you seen t-你看见了吗? —Yes,I have(seen it)一是的,(我看见了)。 ⑤在be,have和do作普通动...
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...
10. 现在完成进行时(have/has been doing) 表示某一动作开始于过去某一时间,延续或重复地出现至今,或将继续延续至将来。 例:We have been working on this project for over a month no...
②被动式:to be done(表示被动,并且一般表示将来) ③进行式:to be doing (表示主动和进行) ④完成时:to have done(表示主动和完成) ⑤完成被动式:to have been done(表示被动和完成) ⑥完成进行式:to have been doing (表示主动和完成进行) 例如: The teacher told us...
Even though the radioactive isotope is considered relatively harmless, the region's fishermen, like its farmers, have been struggling for years to restore the reputation of...
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