notice注意 see看见 look at看 hear听
On seeing the young child fell into the lake,Eric sprang to his feet,and went on the rescue.
2)另一类是某些使役动词,如make, let,have等。如:
Let him do it.让他做吧。
I would have you know that I am ill.我想要你知道我病了。
:
①上述感觉动词与使役动词转换为被动结构时.其后的不定式一般需带to,如:
He was seen to come.
The boy was made to go to bed early.
②在动词find与help之后,不定式可带to亦可不带to,如:
He was surprised to find the sheep break fence at this season.他发现羊在此季节越出栅栏,感到惊讶。
3)在do nothing/anything/everything but结构中。例如:
Last night I did nothing but watch TV.昨天晚上,我除了看电视别的什么也没有干。
但是,如果谓语动词不是do nothing,anything,everything,那么but所跟的不定式则仍须带。
The doctor told him nothing but to stop smoking.医生除了让他戒烟,其它什么都没有说。
There was nothing for them to do but to remain silent.除了保持沉默以外,他们没有别有别的办法。
(4)不定式与动名词的逻辑主语和分词独立结构
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