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1、动词不定式用法总结动词不定式的构成是to+动词原形,但to 有时可以省略。它是一种活跃的非谓语动词形式,很多同学把它和谓语动词混在一起,掌握起来有困难。下面我们就对动词不定式做出简单归纳,帮助同学们记忆。一、不定式作主语在英语中,很多情况下,我们用代词it来代替不定式作主语,而把不定式移到句子的后部以平衡句子。此句式中不定式逻辑上的主语可由for或of引出。( )1.Its our duty _the room every day .A.to clean B.cleaned C.clean D.cleans( )2.Its very nice _you to get me two ticket
2、s _the World Cup.A.for,of B.of ,for C.to,for D.of ,at二、不定式作宾语常见类型如下:1)动词+带to的动词不定式。常见的有:afford,agree,decide,expect,hope,want,fail,plan等,例如:( )3.He wants _some vegetables .A.buy B.buying C.to buy D.buys2)动词+疑问词+带to的动词不定式。( )4.There is no difference between the two words .I really dont know _.A.what t
3、o choose B.which to choose C.to choose which D.to choose what另外,动词不定式用作宾语时,如果后跟形容词作宾语补足语,在这样的复合宾语中,常把it放在宾语的位置作形式宾语,而把不定式放在句尾平衡句子。例如:( )5.He found it very different_.A.sleeping B.sleeps C.fall asleep D.to fall asleep三、不定式作宾语补足语作宾语补足语的句型也有两个。1)动词+宾语+带to的不定式。常见的这类动词有:ask ,teach,tell,want,like,advice,i
4、nvite,allow,warn等。例如:( )6.Robert often asks us _his Chinese ,so his Chinese is much better than before .A.help him B.to help him with C.to help with D.helps him with2)动词+宾语+不带to的不定式。常见的这类动词有:see,hear,watch,notice,let,make,等,例如:( )7.We saw him _into the building and go upstairs.A.to come B.come C.com
5、ing D.came四、不定式作定语不定式作定语,要放在它所修饰的名词或代词的后面。例如:( )8.-Would you like sonething_?-Yes ,please.A.drink B.drinking C.to drink D.drinks五、不定式作状语不定式及其短语具有副词的特性,可在句中用作状语。放在句尾或句首表示目的;也可跟在作表语的形容词或过去分词的后面,还可用于enough to-,too-to等结构中,例如:( )9.She is old enoigh _the things she likes.A.does B.to do C.doing D.did六、不定式作表语在初中阶段出现的不多,常用于“主语+be+to do sth”句型中,此时作主语的中心名词通常是:duty,wish,hope,idea,plan,mistake,等。例如:My duty is to get you away to save you .