He has left for London.他已去了伦敦。
By the end of last month, they had finished half of their work.上月未为止,他们已经完成工作的一半。
2)have + been +现在分词,构成完成进行时,例如:
I have been studying English for ten years.
我一直在学英语,已达十年之久。
3)have+been +过去分词,构成完成式被动语态,例如:
English has been taught in China for many years.
中国教英语已经多年。
助动词do 的用法
1) 构成一般疑问句,例如:
Do you want to pass the CET?你想通过大学英语测试吗?
Did you study German?你们学过吗?
2) do + not 构成否定句,例如:
I do not want to be criticized. 我不想挨批评。
He doesnt like to study. 他不想学习。
In the past, many students did not know the importance of English.过去,好多学生不知道英语的重要性。
3)构成否定祈使句,例如:
Dont go there.不要去那里。
Dont be so absent-minded.不要这么心不在焉。
说明: 构成否定祈使句只用do,不用did和does。
4) 放在动词原形前,加强该动词的语气,例如:
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