the boy wants to go to the dentist ( to )clean teeth.为什么填to而不填for?

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the boy wants to go to the dentist ( to )clean teeth.为什么填to而不填for?
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the boy wants to go to the dentist ( to )clean teeth.为什么填to而不填for?
the boy wants to go to the dentist ( to )clean teeth.
为什么填to而不填for?

the boy wants to go to the dentist ( to )clean teeth.为什么填to而不填for?
The boy wants to go to the dentist ( to ) clean teeth.
这个男孩想去牙医那里清洁牙齿.
因为这一空的后面是动词原形.to do是不定式,表示去牙医处的目的.for是介词,在它后面的动词是不能用原形的,必须改为doing形式,如果是cleaning,则要填for.

to:目的,后面接动词原形
for:也是这个意思,但是后面需要接的是动词ing

动词不定式后面接动词原形,表目的呀。
用for后面不能跟动词原形呀。
明白了吗?

你好
因为 clean 是动词原形,接在to的后面,如果要用for的话,clean应该加ing,即cleaning
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
祝你学习进步,更上一层楼!
不明白请及时追问,满意敬请采纳,O(∩_∩)O谢谢~~谢谢,我想再问一题可以不?I help him ( with )housework and...

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你好
因为 clean 是动词原形,接在to的后面,如果要用for的话,clean应该加ing,即cleaning
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
祝你学习进步,更上一层楼!
不明白请及时追问,满意敬请采纳,O(∩_∩)O谢谢~~

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