Do you know how much this costs?其中为什么cost要加s?不是疑问句都要用原型吗?

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/08 14:50:40

Do you know how much this costs?其中为什么cost要加s?不是疑问句都要用原型吗?
Do you know how much this costs?其中为什么cost要加s?不是疑问句都要用原型吗?

Do you know how much this costs?其中为什么cost要加s?不是疑问句都要用原型吗?
这个疑问句说的是 do you know而costs是宾语从句中的
这句话肯定句应该是 you know how much this costs 你说的疑问句用原型是主句要用原型
这里的主句是you know 举个例子 如果是she knows how much this costs 变为疑问句就是Does she know how much this costs 这个是用的原型
总之就是 变疑问句并不影响从句中的成分

do只对前面这个know起作用 后面的这个从句不受它的影响 主语是this 三人称的单数 用s

这是一个宾语从句，后面从句的时态要根据this这个单数定，就像this is 用的是is 一样

我们可以把cost提前，就变成了this costs you (how much) 。这样就比较简单。然后，因为this是三单嘛，所以就加s。

这是宾语从句里的
我估计你听不懂，听得懂就不至于不知道。

这是一个宾语从句，从句内容不影响主句。 且因为this是单三，所以就加s。

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