Grammar guide Updated 2026-09-10
Comparatives and Superlatives: Rules, Examples and Common Mistakes
Comparatives compare two things; superlatives put one thing at the top of a group. The grammar is small — a handful of endings, two little words and a few irregulars — but the mistakes are stubborn, because English mixes short endings with long words and learners reach for the wrong one. Here is the whole system on one page, in the order you need to build a sentence.
Comparative and superlative forms by adjective length
| Adjective | Comparative | Superlative |
|---|---|---|
| tall (1 syllable) | taller | the tallest |
| happy (2 syllables, -y) | happier | the happiest |
| big (1 vowel + 1 consonant) | bigger | the biggest |
| interesting (3 syllables) | more interesting | the most interesting |
| careful (2 syllables, not -y) | more careful | the most careful |
| good / bad / far | better / worse / further | the best / the worst / the furthest |
Short adjectives: -er and -est
Adjectives of one syllable take -er to compare two things and the -est to compare three or more: tall → taller → the tallest. The spelling follows the same patterns you already know from verbs. Adjectives ending in -e add only -r and -st: nice → nicer → the nicest. One-syllable adjectives ending in one vowel + one consonant double the consonant: big → bigger → the biggest, hot → hotter → the hottest.
Two-syllable adjectives ending in -y change y to -i: happy → happier → the happiest, easy → easier → the easiest, busy → busier → the busiest. A small group of two-syllable adjectives can take either pattern — clever, simple, quiet, narrow, common — so cleverer and more clever are both correct.
Long adjectives: more and the most
Adjectives of three syllables or more use more and the most in front of the word: interesting → more interesting → the most interesting. Two-syllable adjectives that do not end in -y generally do the same: careful → more careful → the most careful, modern → more modern → the most modern.
The golden rule: never use both. More taller and the most biggest are wrong in every register. Choose the ending or the word, never both.
Than, as…as and the
A comparative usually needs than to name the second thing: A car is faster than a bike. She is taller than her brother. Than is followed by a noun or an object pronoun: than me, which in careful writing expands to than I am.
To say two things are equal, use as + adjective + as: This book is as good as that one. He isn't as tall as his father. Not so good as unless you are in a negative comparison, where both are acceptable.
Superlatives almost always take the: Mount Everest is the highest mountain on Earth. It was the best day of my life. The exception is when the superlative means very rather than first of a group: She is a most unusual teacher.
The irregulars and the small words
Four adjectives refuse the pattern and have to be memorised: good → better → the best, bad → worse → the worst, far → further / farther → the furthest / the farthest (further is also used for figurative distance), and little → less → the least.
Two adverbs need care. Well → better → the best and badly → worse → the worst: She sings better than I do. And more and less work before nouns as quantity words: more time, less money, with fewer for countable nouns — fewer people, not less people.
The mistakes learners make most often
Almost every wrong sentence in this area is one of the five below. Read the pair out loud — the wrong version then the right one — and the contrast does the teaching.
✘ This film is more better than the last one. → ✔ This film is better than the last one.
Better is already a comparative. More cannot be added to a comparative form.
✘ She is more tall than me. → ✔ She is taller than me.
One-syllable adjectives take -er, not more: taller, faster, cheaper.
✘ He is the most tall student in the class. → ✔ He is the tallest student in the class.
Same rule for superlatives: short adjectives use the -est form, not the most.
✘ My phone is more expensive than your. → ✔ My phone is more expensive than yours.
Than needs a noun or a possessive pronoun. Yours replaces your phone; your alone cannot stand by itself.
✘ It is the bigger city in Spain. → ✔ It is the biggest city in Spain.
Three or more things means the superlative, and each superlative takes the: the biggest, the most expensive.
How to practise comparatives and superlatives
The form is short, so the practice should be fast and repeated: decide the length of the adjective, choose an ending or more, then check the sentence still needs than or the.
The free comparatives and superlatives drill gives you thirty questions across three question types, each with an explanation. Then stretch the pattern into real use — describing two cities, two phones, two people — with the speaking ideas in our classroom speaking activities post. For a quick daily check, try today's Quiz of the Day. Teachers can print the whole drill as a worksheet with or without the answer key.
Take the Comparatives & Superlatives drill (30 questions) → Build a worksheet Quiz of the Day
Frequently asked questions
How do we form comparatives?
Short adjectives (one syllable) add -er: tall → taller. Two-syllable adjectives ending in -y change to -ier: happy → happier. Longer adjectives use more: more interesting. The comparison is linked with than: A car is faster than a bike.
How do we form superlatives?
Short adjectives use the + -est: the tallest. Longer adjectives use the most: the most interesting. Superlatives nearly always take the definite article, because they point at one member of a group: Mount Everest is the highest mountain on Earth.
Which adjectives are irregular in the comparative and superlative?
Good → better → the best; bad → worse → the worst; far → further or farther → the furthest or the farthest; little → less → the least. The adverbs well and badly follow the same pattern: better and worse.
Why is more better wrong?
Because better is already the comparative of good. Adding more creates a double comparative, which English does not allow. The same rule blocks most biggest and more taller. Use one marker only: better, tallest, more expensive.
Keep reading
Every guide on this blog is paired with a free drill: the same rules, applied question by question, with explanations and a printable worksheet.