Comparing three or more: the tallest, the most expensive, the best
Subject + be + the + superlative (+ in/of group)
Subject + be + not + the + superlative
Is X + the + superlative + in/of...?
💡 Use 'in' for places/groups; 'of' for quantities (the best in the class, the oldest of the three).
✓This is the most beautiful painting.
✗This is the beautifulest painting.
Long adjectives use 'the most'.
✓He's the funniest person I know.
✗He's the most funny person I know.
Funny ends in -y: funniest.
✓It's the worst movie ever.
✗It's the baddest movie ever.
Bad is irregular: the worst.