You saved four hundred quotes this year. Name one. A commonplace book is the four-hundred-year-old fix — and it still works.

Could instead of can, softeners that work, polite disagreement, and the small words that carry English politeness — for B2 to C2 learners.

Why "I did a mistake" sounds wrong, the rule that actually works, and the full list of make/do pairs every B2–C2 learner needs.