how many years does your company has been established?

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how many years does your company has been established?
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how many years does your company has been established?
how many years does your company has been established?

how many years does your company has been established?
有问题.首先does和has been是冲突的.前者是一般现在时的标志用语,后者是现在完成时的标志性用语.根据题意,楼主是要说“你们公司成立了多少年了?”那么就不能用一般现在时,只能用现在完成时.另外,如果在一般现在时语句里,如果有动词,就不需要用助动词does,does是在没有动词的时候充当动词的.
应该是：how many years has your company been estabilshed?
此时也可以用how long,但是由于楼主在问语法有无错误,所以与用语无关.

how long has your company been eatablished?

how many years has your company been established?

这是一个完成时的被动语态，其语法结构是：have[has]+been+动词的过去分词构成。have和has是助动词，变疑问句时把have或has提到主语前。不需要请助动词does，这个句子是个特殊疑问句，它是由特殊疑问词how引导的 后面加一般疑问句，所以是：How many years has your company been established?意思是你的公司成立多少年了？ 如果你有英语...

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这是一个完成时的被动语态，其语法结构是：have[has]+been+动词的过去分词构成。have和has是助动词，变疑问句时把have或has提到主语前。不需要请助动词does，这个句子是个特殊疑问句，它是由特殊疑问词how引导的 后面加一般疑问句，所以是：How many years has your company been established?意思是你的公司成立多少年了？ 如果你有英语问题可找我，我教新概念英语。

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