在线等!求大神分析这句下语法...there has been a need for sththere has been a need for sth 不懂为什么是there has been?真是什么时态呢,.能详细些么 谢谢了!

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在线等!求大神分析这句下语法...there has been a need for sththere has been a need for sth 不懂为什么是there has been?真是什么时态呢,.能详细些么 谢谢了!
在线等!求大神分析这句下语法...there has been a need for sth
there has been a need for sth 不懂为什么是there has been?真是什么时态呢,.能详细些么 谢谢了!

在线等!求大神分析这句下语法...there has been a need for sththere has been a need for sth 不懂为什么是there has been?真是什么时态呢,.能详细些么 谢谢了!
现在完成时的there be句型,表示现在已经需要某物
现在完成时——have/has+been+过去分词
there be 套进去就可以了

there has been a need for sth 是there is a need for sth 的【现在完成时形式】。
意思是:“已经需要某物”。

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there be句型,现在完成时

这是 谓主结构 现在完成时
there 是引导词 不作句子成分has been 是谓语 a need是主语 for sth 是状语