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 tickets _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 to 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，invite，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.coming 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 .