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there have been的用法
there have been 是 there are 的过去完成形式，因此除了时态方面的变化和there are用法差不多。
意思是：已经有了
例如：there have been some apples.
there have been lots of people.
there have been plenty of solutions of this problem.
there has been的用法对吗
there has been 后面接名词 there be 句型的“现在完成时”用法， has 后接单数名词
there have been
there be句型是倒装句,意思是"有",be的形式由be后第一个名词的单复数决定；
there have been,意思是"曾经有",是there be句型的现在完成时态形式,此时be后主语为复数名词,如果be后主语为单数名词,则应为there has been
如
There have been some encouraging signs over the past couple of months.
在过去的几个月里有一些令人鼓舞的迹象.
There has been a singer playing guitar at the bar for many months.
曾经有个歌手在酒吧里弹了几个月吉他.
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