“but”用法.我们说“but”前有实义动词do时,其后的不定式省去“to”.请比较:1、I did nothing but watch TV last night.2、The doctor told him nothing but to stop smoking.

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“but”用法.我们说“but”前有实义动词do时,其后的不定式省去“to”.请比较:1、I did nothing but watch TV last night.2、The doctor told him nothing but to stop smoking.
“but”用法.
我们说“but”前有实义动词do时,其后的不定式省去“to”.请比较:
1、I did nothing but watch TV last night.
2、The doctor told him nothing but to stop smoking.

“but”用法.我们说“but”前有实义动词do时,其后的不定式省去“to”.请比较:1、I did nothing but watch TV last night.2、The doctor told him nothing but to stop smoking.
1.but 是转折关系 原指想做某事 但做别的事
2.这句中的but to do sth 有一定要做的 意思 也有转折的

动词do的任何形式都要把to 省略,那这就包括:do ,did,done,does。其他的就必须带上to,就是其它的动词原形也必须写to,绝对不可以省略。

前后一致.
do nothing but do
told him nothing(to do) but to stop