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?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