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how mang rulers are there in the pencilbox这句话对么,为什么要加are there

题目详情
how mang rulers are there in the pencilbox
这句话对么,为什么要加are there
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答案和解析
是对there be 句型的提问,也可以说是there be 句的特殊疑问句.原句转为陈述句是:there are many rulers in the pencilbox.一般疑问句是 are there many rulers in the pencilbox?