to be done 被动语态 The mouse was killed by me.老鼠被我杀了.
have been done 被动语态,完成时态 The mouse have been killed by me.老鼠已经被我杀了.
have been doing 现在完成进行时态 I have been studying since this afternoon.
我从这个下午就开始学.（现在还在学）
to be done to have been done to have been doing 形式的造句,
to be done to have been done to have been doing 形式的造句,
英语人气：665 ℃时间：2019-10-10 08:05:57
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