I cannot but admire his courage.为什么不是I cannot but to admire his courage.为什么不用to?

I cannot but admire his courage.为什么不是I cannot but to admire his courage.为什么不用to?
I cannot but admire his courage.为什么不是I cannot but to admire his courage.
为什么不用to?

I cannot but admire his courage.为什么不是I cannot but to admire his courage.为什么不用to?
情态动词后跟动词原形,不跟不定式.
She could do nothing but cry.could 是情态动词.
He desired nothing but to succeed.desire是不及物动词,后接不定式.

cannot but[后接原形动词] 是固定用法，意思是：
1. 不得不不能不，不禁要
2. 不得不；不由得，不禁，禁不住；难免；只得；必须

例句：
Icannot but admit the truthofyour remarks, although they are against myinterests.
尽管与我的利益相左，但我不得不承认...

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cannot but[后接原形动词] 是固定用法，意思是：
1. 不得不不能不，不禁要
2. 不得不；不由得，不禁，禁不住；难免；只得；必须

例句：
Icannot but admit the truthofyour remarks, although they are against myinterests.
尽管与我的利益相左，但我不得不承认你说的确实是实话。

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I cannot but admire his courage.
=I cannot (do anything) but admire his courage.
=I cannot do anything, I can only admire his courage. (I can only can be replaced by but)
=Except tha...

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I cannot but admire his courage.
=I cannot (do anything) but admire his courage.
=I cannot do anything, I can only admire his courage. (I can only can be replaced by but)
=Except that I admire his courage I cannot do anything;
No 'to' is followed as it is behind 'can'
Cannot but expresses the idea of "we can do nothing except ..." (formal).
The expression cannot help but is a combination of can't help and cannot but. It is informal.
We can't help admiring his courage.
We cannot but admire his courage. very formal
We cannot help butadmire his courage. very informal(not for academic or business use)
We admire his courage very much.


Jack can't help drinking.
We could not but see that he was drunk.
We couldn't help but see he was drunk.

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can引导的句子当然是用原形啦

因为admire 要做I的谓语的。。。不能加to 啊。。。but前后两谓语是并列关系。。。

1、can（或 could ）......but 后接原形动词是一种固定搭配或固定用法。如：She could do nothing but cry.
can（或 could ）是情态动词。
2、He desired nothing but to succeed. 他什么都不渴望，只渴望达到成功。句中的succeed是动词。
3、He desired nothing bu...

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1、can（或 could ）......but 后接原形动词是一种固定搭配或固定用法。如：She could do nothing but cry.
can（或 could ）是情态动词。
2、He desired nothing but to succeed. 他什么都不渴望，只渴望达到成功。句中的succeed是动词。
3、He desired nothing but success. 他什么都不渴望，只渴望成功。 句中的success是名词。

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