(be being done进行时被动语态)
例The students are cleaning the classroom now.
→The classroom is being cleaned now.
（have been done现在完成时）
例The room has been cleaned by me.
(be being doing)这个貌似没有
BE BEING DOING/BE BEING DONE/HAVE BEEN DONE
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相关问题
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doing having done being done having been done 造句!
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being done,have been done ,have done,done
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must have been done/must be done
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being done having been done的区别
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have been done；have been doing;have been n(如friends);have be
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to have been doing\to be done的被动
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1.现在分词有 doing/being done/having done/having been done等几种形式 那
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to be done 和having been done的用法