Question

英语非谓语动词的用法

看这两个句子为什么一个but后接动词原形，一个接to do?
The departure time of the plane has been postpond.so we have mothing to do now but wait

that was so serious a matter that i had no chioce but to call in the police

Answer 1

介词后面必须带动词的动名词形式,这一规则的唯一例外是except和but(介词).在它们后面带动词原形:

I could do nothing except agree.我除了同意,没有别的办法.

He did nothing but complain.他只是抱怨,什么也不做.

但是如果but用做连词,即如果它引导从句,它的后面就可直接跟完整的不定式或动名词:

Being idle sometimes is agreeable,but being idle all the time might become monotonous.有时清闲无事是令人惬意的,但总是闲呆着就可能变得单调乏味了.

To be idle sometimes is agreeable,but to be idle all the time might become monotonous.有时清闲无事是令人惬意的,但总是闲呆着就可能变得单调乏味了.

lz给的句子里，第一个but后面接的动词，but做介词
后一个but做连词，接的短句

Answer 2

Answer 3

话说我也不太懂 但我老师教过一个前有do后无to 就是but前有do but后动词就没有to 如果but前面没do 动词就用不定式