1
考点
16
动词不定?/p>
高考频度:★★★★?/p>
动词不定?/p>
?
?/p>
动词不定式是非谓语动词的一种,由不定式符号
to+do
构成。没有人称和数的变化,在句子中不?/p>
作谓语,但可做主语、表语、宾语、状语和宾语补足?/p>
,
具有名词、形容词和副词的特征。动词不?/p>
式仍保留动词的一些特点?/p>
?/p>
?/p>
时?/p>
主动
被动
一般式
to do
to be done
完成?/p>
to have done
to have been done
进行?/p>
to be doing
----
完成进行?/p>
to have been doing
----
否定?/p>
否定词(
not/never
?/p>
+
动词不定?/p>
考向一
不定式的作用
1.
作主语: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?/p>
It took us two hours to finish the job.
?/p>
1
)其他系动词?/p>
look
?/p>
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...
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,用
of
,否则用
for
?/p>
2.
作宾?/p>
?/p>
1
)动?/p>
+
不定式?/p>