高三英语一轮复习语法(非谓语动词)归纳

语法(非谓语动词)

I. 动词不定式和动名词的构成形式动词不定式是由“ to + 动词原形” 构成；动名词由动词+ing 构成。

．做主语

⒈不定式作主语动词不定式作主语时，句子的谓语动词常用单数，其位置有以下两种：

(1) 把不定式置于句首。如：

To get there by bike will take us half an hour.

(2) 用it 作形式主语，把真正的主语不定式置于句后，常用于下列句式中。如：

①It ＋be＋名词＋to do

It's our duty to take good care of the old.

②It takes sb + some time + to do

How long did it take you to finish the work?

③It ＋be＋形容词＋for sb ＋to do

It is difficult for us to finish writing the composition in a quarter of an hour.

④It ＋be＋形容词＋of sb ＋to do

It is stupid of you to write down everything the teacher says.

⑤It seems(appears) ＋形容词＋to do It seemed impossible to save money.

在句型③中，常用表示客观情况的形容词，如：difficult, easy, hard, important, impossible, necessary

等；

在句型④中，常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise 等表示赞扬或批评的词。在不定式前的sb，可看作其逻辑主语。这一句式有时相当于Sb is

＋形容词＋to do 句式，如：It's kind of you to help me with my English.=You are kind to help me with my English.

⒉动名词做主语

Learning without practice is no good. 动名词做主语时，也常用It 句式。如：①It's +no

good(no use, fun, a pleasure, a waste of time)+doing ⋯It's no good reading in dim light.

It's no use sitting here waiting.

②It's ＋形容词＋doing

It's dangerous swimming in the sea in windy days.

这样用的形容词有expensive, nice, tiring 等，但important, necessary 则不适用于这种结构，应用不定式代替，如：It's important for you to keep fit.

③There is no + doing

There is no saying what will happen next.

There is no denying that he has stolen the bike. 在这一结构中，动名词后常带宾语，相当于"It's impossible to ⋯"结构。

⒊动词不定式和动名词作主语的区别①不定式作主语经常表示具体动作，常与特定的动作执行者联系在一起；而动名词作主语经常表示抽象动作，经常不与特定的动作执行者联系在一起。如：It's no good eating too much fat.

It's no good for you to eat so much fat. ②动名词结构作主语，可以用名词或代词属格形式作逻辑主语。如：It's no use your pretending that you didn't know the rules.

二、作宾语⒈不定式作宾语

①以下动词后，只能跟不定式作宾语。如：agree,

ask, aim, arrange, choose,

decide, demand, expect, fail ,help, hope, lean, long, manage, offer, plan, prepare, pretend, promise, refuse, wish 等，这些词大部分可

接that 引导的从句。如：

I decided to ask for my money back.

I decided that I would ask for my money back.

When our visit to the farm was over, we expected to start back on foot.

When our visit to the farm was over, we expected that we would start back on foot.

②当复合宾语中的宾语是不定式时，先用形式宾语it 代替不定式，把不定式置于补语之后，

即：主语＋动词＋it ＋补语＋to do 句式。如：

We think it quite important for us to learn a foreign language well.

He feels it his duty to help the poor.

③介词but, except, besides + to do(do) 在这种句型中，如介词前有动词do，后面应接不带to 的不定式；如无do，则接to 不定式，即带do 不带to ，带to 不带do。如：

The enemy soldiers had no choice but to give in.

On Sunday afternoon I had nothing to do but watch TV.

⒉动名词作宾语

①以下动词后，只能接动名词作宾语，如：admit, appreciate, consider, delay, enjoy, finish, keep, imagine, mind, miss, practise, resist, risk, save, suggest, don't mind, give up, insist on, put off 等。如：

I suggest spending our summer vacation in a seaside town.

You must give up smoking, for it does too much harm to your health. ②动名词作介词的宾语