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

gerund – n. n English noun formed from a verb by adding -ing

introduce – n. to mention or refer to something for the first time

formal – adj. suitable for serious or official speech and writing

endorse – v. to publicly or officially say that you support or approve of (someone or something)

decade – a period of ten years

contrast – v. to compare (two people or things) to show how they are different

intruder – n. a person who enters a place illegall