| One syllable, or two ending in -y | + er / + est | Trains are faster than buses. / It's the cheapest. |
| Spelling | add r after -e; y becomes i; double one final consonant | nice → nicer / happy → happier / big → bigger |
| Other adjectives of two or more syllables | more + adjective / the most + adjective | This bag is more expensive. |
| Irregular | good → better → the best / bad → worse → the worst | It's the best film of the year. |
| comparative + than | compares two things; speech has an object pronoun after than | She is taller than me. |
| the + superlative + in / of | top of three or more; in a place or group, of a number | She is the tallest in the class. |
| as + adjective + as / not as + adjective + as | equal; not equal | My flat is as big as yours. / Tea is not as strong as coffee. |
| Trap | better and worse are already comparatives | This is better. |