How much water do you want?为什么要加do you >

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How much water do you want?为什么要加do you >
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How much water do you want?为什么要加do you >
How much water do you want?为什么要加do you >

How much water do you want?为什么要加do you >
在特殊疑问句中,除了句首加疑问词:how,when,where,who,what...,还需要把句子里的系动词(be)或情态动词(can may must should...)提到主语前面,假如只是一个实意动词,那就要加上助动词do,放到主语前面,成为疑问句的标志.
比如:what can you do for me?(情态动词放到主语前)
how old is she?(系动词放在主语前)
where does he go?(加助动词放在主语前)

疑问句的基本语法

句子的基本成分是主语谓语加宾语,不妨把这个句子重新转化为陈述句,你需要水,you 很显然就是主语不能缺失,再转化为疑问句时需要助动笔,因而用到do you

用在疑问句中