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how mang rulers are there in the pencilbox

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how mang rulers are there in the pencilbox
这句话对么,为什么要加are there
how mang rulers are there in the pencilbox
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?
再问: there is one ruler in the pencil box对one 进行提问应该是什么,到底是
How many ruler is there in the pencil box? 还是how many rulers are there in the pencilbox 为什么
再答: 这里只能是how many rulers are there in the pencilbox ? ruler是可数名词,提问只能是how many,be动词必然是 are