
.
非谓语动?/p>
在句中充当除谓语以外的句子成分的动词形式叫做非谓语动词。非谓语动词分为三种形式:不定式、动
名词和分词(分词包括现在分词和过去分词)
不定?/p>
一?/p>
不定式的作用
1
?/p>
作主?/p>
不定式作主语时,谓语用单数。往往?/p>
it
作形式主语,把不定式放在谓语后面。如?/p>
It took us two hours to finish the job.
It is impossible for us to get there on time.
It is very kind of you to help us.
注意:(
1
)其他系动词?/p>
look, appear
等也可用于此句型?/p>
?/p>
2
)当不定式作主语的句子中又有一个不定式作表语时,不能用
It is …to?/p>
的句型。试比较?/p>
It is to negate my own idea to believe him.
(错?/p>
To believe him is to negate my own idea .
(对?/p>
?/p>
3
?/p>
It is+ adj. of / for sb. to do sth.
结构中,
当不定式的逻辑主语和前面的形容词可以构成系表结构时?/p>
?/p>
of,
否则
?/p>
for.
2
?/p>
作宾?/p>
?/p>
1
?/p>
动词
+
不定式。如?/p>
He managed to escape from the fire.
I find it hard to get along with him.
?/p>
it
作形式宾语)
注:
下列动词通常用不定式作宾语:
want, try, hope, wish, need, forget, know, promise, refuse, help, decide, begin,
start, learn, agree, choose, get
?/p>