Comparative Adjectives: Forms, Rules and Examples in English

Overview

A comparative adjective is a form of an adjective used to compare two people, places, things, or ideas. Sentences like this road is longer than that one or the second candidate seemed more confident than the first both use comparative adjectives to show that one thing has a greater or lesser degree of a quality than another.

The rules for forming comparative adjectives depend primarily on the number of syllables in the base adjective, with some irregular forms to commit to memory.

Forming Comparative Adjectives

One-Syllable Adjectives

Adjectives of one syllable form the comparative by adding -er directly to the base form.

When the base adjective ends in a single vowel followed by a single consonant, the final consonant is doubled before adding -er. This spelling rule preserves the short vowel sound of the original word.

When the base adjective already ends in -e, only -r is added rather than the full -er suffix.

Two-Syllable Adjectives

Two-syllable adjectives follow one of two patterns depending on their ending. Adjectives ending in -y form the comparative by changing the -y to -i and adding -er. Most other two-syllable adjectives use more before the base form.

Some two-syllable adjectives accept both patterns. Words like simple, gentle, narrow, clever, and quiet can take either -er or more without producing an error.

When in doubt with a two-syllable adjective that does not end in -y, using more is the safer choice.

Three or More Syllables

All adjectives of three syllables or more form the comparative with more before the base form. The -er suffix is never added to adjectives this long.

Irregular Comparative Adjectives

A small number of adjectives form their comparative with a completely different word. These irregular forms must be memorised.

Farther and further are both accepted comparative forms of far, though further is more common in British English and increasingly used in both physical and figurative contexts. Elder is used specifically for family relationships, particularly siblings, and does not appear in comparative constructions with than.

Using Than in Comparative Sentences

A comparative adjective typically introduces a comparison completed with than. The word than connects the two elements being compared.

When the second element of the comparison is a pronoun, formal English uses the subject pronoun after than, while informal spoken English frequently uses the object pronoun.

The comparative can also be used without than when the context makes the point of comparison clear.

Modifying Comparative Adjectives

Comparative adjectives can be strengthened or weakened by adding a modifier before them. Common modifiers include much, far, a lot, slightly, a little, and considerably.

The modifier a bit is widely used in spoken English for small differences. In formal writing, slightly or somewhat is preferred.

Comparing Comparative Formation Patterns

Common Mistakes to Avoid

Mistake 1: Using Both -er and More Together

Adding -er and more to the same adjective produces a double comparative. Only one method is correct for any given adjective.

Mistake 2: Applying -er to Long Adjectives

The -er suffix is restricted to short adjectives. Adding it to adjectives of three or more syllables produces forms that do not exist in standard English.

Mistake 3: Forgetting to Double the Final Consonant

When a one-syllable adjective ends in a single vowel followed by a single consonant, the consonant must be doubled before -er. Omitting the doubling changes the pronunciation and is a spelling error.

Mistake 4: Using Then Instead of Than

Then is an adverb of time. Than is the conjunction used in comparative constructions.

Mistake 5: Incorrect Irregular Comparative Forms

Using a regular -er or more form for an adjective that has an irregular comparative is a consistent error.

Mistake 6: Failing to Change -y to -i Before -er

When a two-syllable adjective ends in -y, the -y must change to -i before adding -er.

Practice Exercises

Exercise 1: Form the Comparative

Write the comparative form of each adjective.

1. slow
2. expensive
3. happy
4. good
5. wet
6. comfortable
7. far
8. thin
9. bad
10. interesting

Exercise 2: Complete the Sentence

Fill in the blank with the comparative form of the adjective in brackets.

1. The second interview felt ______ than the first. (relaxed)
2. She finished the task ______ than anyone had expected. (fast)
3. The new building is ______ than the original design suggested it would be. (tall)
4. This explanation is ______ than the one in the textbook. (clear)
5. He has been ______ since he started exercising regularly. (healthy)
6. The results were ______ than last quarter, which surprised everyone. (bad)

Exercise 3: Correct the Error

Each sentence contains one comparative adjective error. Rewrite it correctly.

1. She is more smarter than people often assume when they first meet her.
2. The new policy is importanter to the organisation than the previous one.
3. His second essay was much more better written than his first attempt.
4. The weather became hoter as the afternoon went on.
5. This solution is more gooder for the environment than the alternatives.
6. The journey took longer then we had planned when we left the hotel.

Exercise 4: Write Your Own Comparative Sentences

Use the prompts to write a comparative sentence with than. Use a modifier such as much, far, slightly, or a little in at least two of your sentences.

1. this coffee / strong / the one yesterday
2. the second candidate / confident / the first
3. her new apartment / far from the centre / the old one
4. the revised report / easy to read / the original version
5. this winter / cold / last year

Summary

Short adjectives take -er, long adjectives take more, and a small set of common adjectives use irregular forms entirely.