动词不定式是指由”to” + 动词原形构成的非谓语动词形式,可以作为名词、形容词或副词的宾语、表语、定语或状语等。动词不定式一般有三种形式:
原形不定式:即”to + 动词原形”,如to go、to play等。
完成不定式:即”to have + 过去分词”,如to have gone、to have played等。
进行不定式:即”to be + 现在分词”,如to be going、to be playing等。
动词不定式可以用来表达目的、结果、原因、条件、方式等意义,常常用于以下结构中:
作主语:To learn English well is very important.
作宾语:I want to study abroad.
作表语:My dream is to become a doctor.
作定语:The best way to learn English is to practice more.
作状语:He came to see me yesterday.