问题描述：
提问there are some books and pens 为什么用（what are there/what is） on the table?
there be 句型为啥用单数,这里的 what are there怎么等于 what is了?
there be 句型为啥用单数,这里的 what are there怎么等于 what is了?
问题解答：
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