英语语法 be beenmy letter has been lost by me.you watch will be repaired.请问一下这两句话里不是有be动词了么,为什么后面还要加been和be呢请详细把用法解说下吧.老是搞不懂?

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英语语法 be beenmy letter has been lost by me.you watch will be repaired.请问一下这两句话里不是有be动词了么,为什么后面还要加been和be呢请详细把用法解说下吧.老是搞不懂?
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英语语法 be beenmy letter has been lost by me.you watch will be repaired.请问一下这两句话里不是有be动词了么,为什么后面还要加been和be呢请详细把用法解说下吧.老是搞不懂?
英语语法 be been
my letter has been lost by me.
you watch will be repaired.
请问一下这两句话里不是有be动词了么,为什么后面还要加been和be呢
请详细把用法解说下吧.老是搞不懂?

英语语法 be beenmy letter has been lost by me.you watch will be repaired.请问一下这两句话里不是有be动词了么,为什么后面还要加been和be呢请详细把用法解说下吧.老是搞不懂?
My letter has been lost by me.
被动语句 主动词是lose 因为是被动 所以变为过去分词 结构是 be + pp
pp 就是过去分词
然后这件事情由于对现在又影响 所以考虑变为现在完成时 have been + pp
加之主语第三人称单数 所以 has been lost by
Your watch will be repaired.
被动句 将来时态 will be + pp
我觉得lz需要好好再看看这个