- Short adjectives add -er (taller); longer adjectives use more (more interesting).
- Use than after a comparative: She is older than me.
- as…as expresses equality; not as…as expresses inequality.
- much, far, a bit, and slightly make comparatives stronger or weaker.
- Double comparatives (the more…the better) show that two things change together.
Comparison is one of the things we do most often in everyday language: this is cheaper than that, today is hotter than yesterday, my new phone is much faster than the old one. English has a clear system for making comparisons, but it contains several patterns that learners must master separately, and a number of small mistakes that even confident speakers make. This guide covers the whole system, from the basic rules for forming comparatives to the more advanced structures used to show that two things change together.
We will move step by step, beginning with how to build a comparative adjective, then how to complete the comparison, and finally how to make it more expressive and avoid the typical errors. With practice, these structures become automatic and your written and spoken English will sound noticeably more natural.
1. Forming Comparatives
The first rule depends on the length of the adjective. Short adjectives add the ending -er; longer adjectives are preceded by more.
| Adjective type | Rule and example |
|---|---|
| One syllable | add -er: tall → taller, cheap → cheaper |
| One syllable, ends -e | add -r: large → larger, nice → nicer |
| Consonant + vowel + consonant | double the consonant: big → bigger, hot → hotter |
| Two syllables, ends -y | change y to i + er: happy → happier, easy → easier |
| Two or more syllables | use more: more careful, more expensive |
| Irregular | good → better, bad → worse, far → further/farther |
Never combine the two methods. “More taller” and “more bigger” are always wrong. Use either -er or more, never both: taller (not “more taller”), more interesting (not “more interestinger”).
2. Using “than”
When you state what you are comparing with, you connect the two parts with than. This is the most common comparative structure in English.
- Tokyo is larger than Madrid.
- This exercise is more difficult than the last one.
- He arrived earlier than expected.
In formal English, a subject pronoun follows than: She is taller than I (am). In everyday speech, an object pronoun is normal and widely accepted: She is taller than me. Both are correct in their context; the object form is far more common in conversation.
3. The as…as Structure
To say that two things are equal in some quality, English uses as + adjective + as. This structure does not change the adjective at all.
- Equality: She is as tall as her brother. (they are the same height)
- Inequality: This film is not as good as the book. (the book is better)
- With nouns: I have as many books as you. / There isn't as much time as we thought.
Note the difference between as much as (uncountable nouns) and as many as (countable nouns). You can also strengthen the comparison: just as good as, nearly as expensive as, not nearly as difficult as.
“Not so…as” is a slightly more formal alternative to “not as…as”: It is not so cold as yesterday. In modern everyday English, not as…as is the more common choice.
4. Much, Far and Other Intensifiers
To show how big the difference is, English places an intensifier before the comparative. These adverbs make a comparison stronger or weaker.
| Intensifier | Example |
|---|---|
| much / far (big difference) | This is much cheaper. / It's far more difficult. |
| a lot (informal, big) | She's a lot happier now. |
| a bit / a little (small) | It's a bit colder today. |
| slightly (small, formal) | The results were slightly higher. |
| even (more than expected) | It's even better than I thought. |
A common error is using very with a comparative. You cannot say “very cheaper.” Use much instead: much cheaper. “Very” goes only with the plain adjective: very cheap.
5. Double Comparatives
There are two important structures using double comparatives, and both express change.
The more…the more
This pattern shows that two things change together: as one increases, so does the other. The structure is the + comparative … the + comparative.
- The more you practise, the better you become.
- The hotter it gets, the more tired I feel.
- The sooner, the better. (a short, fixed expression)
Comparative + and + comparative
This pattern shows a continuous change over time, with the same comparative repeated and joined by and.
- It is getting colder and colder.
- The queue grew longer and longer.
- With more: The lessons became more and more difficult.
6. Common Mistakes
A few errors appear again and again in learners' English. Watching for these will quickly improve your accuracy.
- Double marking: “more easier” → easier. Never use more with an -er form.
- Wrong connector: “older that me” → older than me. Use than, not that.
- Very + comparative: “very better” → much better.
- as…than: “as tall than him” → as tall as him. The pattern is as…as, never as…than.
- much / many confusion: “as much books” → as many books (countable).
Practise Comparatives
Test your knowledge with LexFizz interactive grammar exercises designed for A2-B2 learners.
Start Practising →Frequently Asked Questions
When do I use “-er” and when do I use “more”?
The choice depends on the length of the adjective. One-syllable adjectives take the ending -er: tall becomes taller, cheap becomes cheaper. Adjectives of three or more syllables take more: more interesting, more expensive. Two-syllable adjectives are mixed: those ending in -y take -er (happy to happier), while most others take more (more careful). A small group of two-syllable adjectives such as clever, quiet, and simple accept both forms. The most important rule is never to combine the two methods — “more taller” is always wrong.
Should I say “than me” or “than I”?
Both are used, but in different registers. In formal and traditional grammar, a subject pronoun follows than because a verb is understood: “She is taller than I (am).” In everyday spoken English, however, the object pronoun is normal and completely acceptable: “She is taller than me.” In most conversation and informal writing, the object form is far more common and sounds natural. The subject form can sound stiff or overly formal in casual contexts. Unless you are writing a very formal document, “than me” is a safe and natural choice.
What is the difference between “as…as” and “than”?
The two structures express different relationships. “As…as” shows equality: “She is as tall as her brother” means they are the same height, and the adjective stays in its plain form. “Than” is used with a comparative to show difference: “She is taller than her brother” means one is taller. To express inequality with the as structure, add not: “This film is not as good as the book” means the book is better. Mixing them is a common error — you cannot say “as tall than”; it must be “as tall as.”
Why can't I say “very better” or “very cheaper”?
The adverb “very” cannot modify a comparative adjective. It works only with the plain form: “very cheap,” “very good.” To intensify a comparative, English uses “much,” “far,” “a lot,” or “even” instead: “much cheaper,” “far better,” “a lot easier,” “even bigger.” This is a frequent mistake because in many languages the equivalent of “very” can intensify comparisons, but English does not allow it. If you want to say the difference is small, use “a bit,” “a little,” or “slightly” instead: “slightly cheaper.”
How do double comparatives like “the more…the better” work?
This structure shows that two things change together: as one increases, the other does too. The pattern is “the + comparative…the + comparative,” as in “The more you practise, the better you become” or “The hotter it gets, the more uncomfortable I feel.” The first clause states the condition and the second states the result. There is a popular short form, “The sooner, the better,” where the verb is dropped. This is a high-level structure that makes your English sound fluent and natural, and it is well worth practising until it feels automatic.
What does “colder and colder” mean?
Repeating a comparative joined by “and” expresses a continuous change over time — something is steadily increasing or decreasing. “It is getting colder and colder” means the temperature keeps falling progressively. With longer adjectives that use “more,” the pattern becomes “more and more”: “The lessons became more and more difficult.” This structure is common with verbs of change such as “get,” “become,” and “grow.” It paints a picture of gradual development rather than a single comparison, which makes it useful for describing trends, processes, and situations that develop over a period of time.
When do I double the final consonant before adding “-er”?
You double the final consonant when a one-syllable adjective ends in a single consonant preceded by a single vowel — the consonant-vowel-consonant pattern. So “big” becomes “bigger,” “hot” becomes “hotter,” and “thin” becomes “thinner.” You do not double the consonant if there are two vowels (“cheap” to “cheaper”) or two final consonants (“fast” to “faster”). The letters w, x, and y at the end are never doubled, so “new” becomes “newer,” not “newwer.” This spelling rule is the same one used for adding -ing and -ed to short verbs.
What is the difference between “further” and “farther”?
Both are comparative forms of “far,” and for physical distance they are interchangeable: “The shop is farther/further down the road.” However, only “further” is used in abstract or figurative senses meaning “additional” or “more”: “for further information,” “further discussion,” “nothing could be further from the truth.” In practice, “further” is the safer and more common choice in British English, while American English uses “farther” slightly more often for literal distance. If you are unsure which to use, “further” works in almost every situation, both physical and abstract.
Can I use “as much” and “as many” interchangeably?
No — the choice depends on whether the noun is countable or uncountable, exactly as with “much” and “many” generally. Use “as many” with countable plural nouns: “I have as many books as you.” Use “as much” with uncountable nouns: “There isn't as much time as we thought.” Mixing them, such as saying “as much books,” is a common error. When there is no noun and you are comparing amounts in general, “as much” is used: “I don't earn as much as her.” Keeping the countable/uncountable distinction in mind solves the problem reliably.
Is “more better” ever correct in English?
No, “more better” is never correct in standard English. “Better” is already the comparative form of “good,” so adding “more” doubles the comparison, which the grammar does not allow. The correct word is simply “better.” The same applies to other irregular comparatives: say “worse,” not “more worse,” and “further,” not “more further.” This double-marking error is one of the most frequent mistakes among learners and also among some native speakers in casual speech. To intensify “better,” use “much,” “far,” or “even”: “much better,” “even better.”