形容词 B2 Formal speech or behaviour is very correct and serious rather than relaxed and friendly, and is used especially in official situations. He wrote a very formal letter of apology to Douglas. We use formal language in situations that are serious or that involve people we don’t know well. See examples of formal used in a sentence. 4. . Definition of formal adjective in Oxford Advanced Learner's Dictionary. How to use formal in a sentence. We use formal language in situations that are serious or that involve people we don’t know well. 1.

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