改被动语态He was doing his homework at this time yesterday .
题目
改被动语态He was doing his homework at this time yesterday .
He was doing his homework at this time yesterday .
--His homework was being done by him at this time yesterday
...为什么不能改成
His homework was done by him at this time yesterday
答案
过去完成时的被动语态就是
was/were + being + done 记住就行了
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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