非谓语动词时态问题 doing表主动 为什么
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being done 和having been done是被动语态,表示被动
举个例子：
Yesterday,when I saw him,he was playing basketball.
Yesterday,when I saw the dog,it was being fed.
第一句是主动,第二句是被动,当然是不一样的.
举个例子：
Yesterday,when I saw him,he was playing basketball.
Yesterday,when I saw the dog,it was being fed.
第一句是主动,第二句是被动,当然是不一样的.
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