作业帮请问HAS BEEN和 HAVE BEEN HAD BEEN的用法以及分别加DONE后的用法请问HAD BEEN 单复数用法有区别吗
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请问HAS BEEN和 HAVE BEEN HAD BEEN的用法以及分别加DONE后的用法请问HAD BEEN 单复数用法有区别吗
请问HAS BEEN和 HAVE BEEN HAD BEEN的用法以及分别加DONE后的用法
请问HAD BEEN 单复数用法有区别吗
请问HAS BEEN和 HAVE BEEN HAD BEEN的用法以及分别加DONE后的用法请问HAD BEEN 单复数用法有区别吗
have been 和 has been 只是根据前面主语的人称而定.都是一般现在完成时
简单来说如果前面是I,you,we以及复数形式的主语则是have been
第3人称单数如he,she,it,则是用has been
有been的话表示被动语态
had been则是过去的过去,是过去完成时,和上面一样有been的话表示被动语态
如果都加done的话,都是表示已经做完某个事情,只是时态不同
had been 单复数用法没有区别 第一第三人称都是用had
1. has been done 和have been done 都是一般现在时，前者用于单数主语；后者用于复数主语。 比如：
The room has been cleaned. 房间已经被清扫了。
The rooms have been cleaned. 这些房间已经被打扫了。
2。had been done是过去完成时，用于讲述过去的过去
（当你想...
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1. has been done 和have been done 都是一般现在时，前者用于单数主语；后者用于复数主语。 比如：
The room has been cleaned. 房间已经被清扫了。
The rooms have been cleaned. 这些房间已经被打扫了。
2。had been done是过去完成时，用于讲述过去的过去
（当你想说发生在过去的两件事时，就要分清谁先谁后。先发生的用过去完成时，后发生的要用过去时）。
The rooms had been cleaned when I came. 我来的时候，房间已经被打扫了。
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has been 和have been 都是现在完成时，前者用于主语是第三人称单数，后者用于不是第三人称单数。而had been是过去完成时，表示的时间是“过去的过去”。
比如：He has been to Beijing before.
We haven't been to Shanghai yet.
They said they had been there befor...
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has been 和have been 都是现在完成时，前者用于主语是第三人称单数，后者用于不是第三人称单数。而had been是过去完成时，表示的时间是“过去的过去”。
比如：He has been to Beijing before.
We haven't been to Shanghai yet.
They said they had been there before.
如果在后面加done的话，就表示被动的含义。
又如：His homework has been finished now.
The exercises hav been done .
He said that the building had been built .
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