How much does it cost?
问题描述:
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
答
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...