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B2 Idiomatic Expressions — Espressioni Idiomatiche B2·Register and Usage — Formal vs Informal Idioms
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Rule reminder

Idioms vary greatly in register. Some are perfectly appropriate in formal writing (journalism, essays), while others are colloquial and would be out of place in formal contexts. Misusing a colloquial idiom in a formal letter is a significant error at B2 level.

Register and Usage — Formal vs Informal Idioms1 / 10

You are writing a formal business report. Which expression is appropriate?

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