还原成陈述句,可以帮助你理解:
there are 7 days in a week
然后,你对7 进行画线部分提问,就得到此句
规则是:首先确定特殊疑问词,是how many days,然后,原句的there are ,的are 提前,就得到
How many days are there in a week
如果还有疑问,比如,为何要加be 动词,欢迎追问
are是动词,是谓语,一个句子缺少谓语便不能组成句子。there + be动词 是一个固定句型,表示有...
你可以理解成There are many days in a week 的疑问句