I want to see the dentist,please!和 I must see the dantist,now.第一句为什么要加to?

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I want to see the dentist,please!和 I must see the dantist,now.第一句为什么要加to?
I want to see the dentist,please!和 I must see the dantist,now.第一句为什么要加to?

I want to see the dentist,please!和 I must see the dantist,now.第一句为什么要加to?
want to 固定搭配
想要的意思
我要看牙医 我必须现在看牙医

want to do sth 这是固定搭配
must是情态动词 不能加不定式

want to want后必须加to

must是情态动词,之后直接跟宾语,want为实义动词,之后接动词不定式,因此加to

I want and I must is different.... I want 是你想要....I must 是你一定要

want to do
must do