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C1 — Precision

The fine details. This is the difference between “pretty good English” and “wait, are you a native speaker?” Most of this is about natural word combinations and register awareness — things that textbooks rarely teach well.

Advanced Modals

“You needn’t have bothered.” “She could have been waiting.” The modal combinations that express subtle meanings.

Collocations

Why “make a decision” but “do homework.” Why “strong coffee” but not “powerful coffee.” The unwritten rules.

Register & Formality

How the same idea sounds different in a text message, an email, a meeting, and an academic paper.

Ellipsis & Substitution

“I can and I will.” “So do I.” — the art of leaving words out and still being clear.