This has not been easy because i own over a thousand books.这句话中been是什么用法

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Thishasnotbeeneasybecauseiownoverathousandbooks.这句话中been是什么用法Thishasnotbeeneasybecauseiownoverathous

This has not been easy because i own over a thousand books.这句话中been是什么用法
This has not been easy because i own over a thousand books.这句话中been是什么用法

This has not been easy because i own over a thousand books.这句话中been是什么用法
be的过去分词,this is not easy是一般现在时态句式.

过去分词吧、

完成时动词变为过去分词。

现在完成时,因为been前有has