How much does it cost?

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/05 02:56:42

How much does it cost?
这句中的does
为什么不直接How much it cost?
或者How much is it cost?可以吗

疑问句一般需要助动词提前.how much it cost?这句话缺少助动词.特殊疑问句的结构是特殊疑问词+一般疑问句.一般疑问句都是动词提前.有系动词或情态动词的,把系动词或情态动词提前.没有的,前面加上助动词do.助动词也有人称,数,时态的变化.
另外,how much is it cost?也不对.
一般现在时态表示的是目前的状态或动作.一般表状态用系动词be,系表结构作句子谓语.cost是实意动词,不能表状态,所以这句话是错的.

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