Register — Formal vs Informal Idioms — B2 Idiomatic Expressions — Espressioni Idiomatiche B2 (B2)

B2 Idiomatic Expressions — Espressioni Idiomatiche B2·Register — Formal vs Informal Idioms

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Rule reminder

Not all idioms are appropriate in all contexts. At B2 level, understanding register — knowing when an expression is too colloquial for a formal context — is essential for real-world communication.

You are writing a formal business email to a client you have never met. You want to say that the keynote speech was the highlight of the conference. Which option is appropriate?