VOA慢速英语:不定式真的是动词吗？

journey –n. traveling from one place to another; a trip

phrase -–n. a group of two or more words that express a single idea but are not a complete sentence

focus –v. to cause you attention to be directed at something

screw –n. a small, pointed metal device used to hold two materials, such as wood or metal, together

formal –adj. used in serious or official speech and writing

literature –n. written works such as plays, poems, and books

modal –adj. a verb usually used with another verb to express an idea of possibility, necessity or permission