‘Within’ is a preposition with two main uses: space (inside a boundary) and time (no later than a point). - Space: We live within ten miles of the coast. - Time: Your tickets will arrive within three days. ⚖️ In vs. Within - Use in for something definite (The film ends in 1 hour). - Use within when stressing a limit or estimation (It’ll arrive within 3 days). Tip: If you’re unsure, try ‘in’. It usually works—though not always (You’re in trouble ✅ / You’re within trouble ❌). Think of within as po