VOA慢速英语:Infinitives in Everyday Speech

infinitive – n. grammar the basic form of a verb

conversation – n. a spoken exchange involving two people or a small group of people

modify – v. grammar: to limit or describe the meaning of (a word or group of words)

tense – n. grammar a form of a verb that is used to show when an action happened

imprecise – n. not clear or exact

phrase – n. a group of two or more words that express a single idea but do not usually form a complete sentence

stuff – n. materials or things

feature – n. the structure, form or appearance of something; a quality

grammar – n. the study of words and their uses in sentences

informal – adj. lacking ceremony; of or related to familiar use