不定式是什么?

英语语法(动词不定式)

动词不定式是一种非限定性动词，由to＋动词原形构成，但它还是属于动词，所以它本身可以带宾语和状语。动词不定式在句中可以作主语、宾语、表语、定语和状语，还可用在复合结构中，而且有完成式、进行式、完成进行式和否定形式。动词不定式的被动形式除了一般形式外还有其完成式和进行式。动词不定式的特殊情况也要掌握。

第一节 动词不定式的构成与形式

一、动词不定式的概念：动词不定式指由to 加上动词原形(而且只能是动词原形)所构成的一种非限定性动词，但在有些情况下to可以省略。动词不定式在语法功能上可作主语1) 、宾语2)、表语3)、定语4) 和状语5)

1) education is the principal way of gaining status in a culture that generally stresses achievement，skillfulness，and upward mobility.
〔A〕 To acquire
〔B〕 Acquire
〔C〕 Acquires
〔D〕 Have acquired
2) We are planning for the entrance examination for postgraduate.
〔A〕 registering
〔B〕 register
〔C〕 to register
〔D〕 registered
3) The most urgent problem now we are facing is to learn the needed materials for the matriculation of postgraduate.
〔A〕 make our every effort
〔B〕 to make our every effort
〔C〕 to our every effort
〔D〕 made our efforts
4) —Where should I send my application?
—The Perso