过去完成时的被动语态就是
was/were + being + done 记住就行了
改被动语态He was doing his homework at this time yesterday .
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
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
英语人气：765 ℃时间：2019-08-19 12:37:59
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