When the plane is to take off has not been announced 飞机何时起飞还没有宣布飞机何时起飞还没有:When the plane is to take off has not 为什么这边需要用过去分词加announced 这是什么形式.?

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Whentheplaneistotakeoffhasnotbeenannounced飞机何时起飞还没有宣布飞机何时起飞还没有:Whentheplaneistotakeoffhasnot为什么这边需要用

When the plane is to take off has not been announced 飞机何时起飞还没有宣布飞机何时起飞还没有:When the plane is to take off has not 为什么这边需要用过去分词加announced 这是什么形式.?
When the plane is to take off has not been announced 飞机何时起飞还没有宣布
飞机何时起飞还没有:When the plane is to take off has not
为什么这边需要用过去分词加announced 这是什么形式.?

When the plane is to take off has not been announced 飞机何时起飞还没有宣布飞机何时起飞还没有:When the plane is to take off has not 为什么这边需要用过去分词加announced 这是什么形式.?
announce 是人为动作 所以主语为 When the plane is to take off 起飞时间 的时候 主语是被announce 所以是 be announced
时间是被人宣布的

has not been announced 现在完成时,have been done sth.,这边是被动语态

has not been announced -------是“被动语态”形式,解释为:还没有被通知。

这不是表示被动语态嘛!!!

首先分析句子成分,题中的句子是一个主语从句,主语是一个When the plan is to take off,我们把它替换成It,原句就变成It has not been announced,显然是一个现在完成时的否定句,现在完成时的语法楼主应当知道,所以在此就不用多说,for example, what you have asked hasn't bees solved now. 意思是您提的...

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首先分析句子成分,题中的句子是一个主语从句,主语是一个When the plan is to take off,我们把它替换成It,原句就变成It has not been announced,显然是一个现在完成时的否定句,现在完成时的语法楼主应当知道,所以在此就不用多说,for example, what you have asked hasn't bees solved now. 意思是您提的问题到现在还没解决。

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