Comparative Structures

The choice depends mainly on the length of the adjective. One-syllable adjectives usually add -er (tall → taller, fast → faster). Two-syllable adjectives ending in -y change to -ier (happy → happier). Most other two-syllable adjectives and all adjectives of three or more syllables use more (more useful, more interesting, more comfortable). A few adjectives are irregular: good → better, bad → worse, far → further.

Superlatives follow the same length rule as comparatives but use -est or most, and they take “the”. Short adjectives add -est (the tallest, the biggest, the happiest), while longer adjectives use the most (the most interesting, the most expensive). Irregular superlatives include the best, the worst, and the furthest. We use superlatives to compare one thing with all the others in a group: This is the highest mountain in Europe.

We use as + adjective or adverb + as to say two things are equal in some quality: She is as tall as her brother. He runs as fast as I do. To say they are not equal, we use not as…as (or the slightly more formal not so…as): This phone is not as fast as that one, which means it is slower. For quantities we use as much as (uncountable) and as many as (countable): I have as many books as you.

Because you should never combine two comparative markers. “Taller” is already comparative, so adding “more” is a double comparative and is incorrect. The same applies to irregular forms: “better” already means more good, so “more better” is wrong. Choose one method only: either add -er, or use more, but never both at the same time on the same adjective.

Add a modifier before the comparative. For big differences use much, far, a lot, or considerably: much cheaper, far more difficult, a lot better. For small differences use a bit, a little, or slightly: a bit colder, slightly more expensive. Remember that “very” cannot modify a comparative — you cannot say “very cheaper”. Use much or far instead.

This structure shows that two things change together, with one change causing or matching the other. The pattern is: the + comparative + clause, the + comparative + clause. For example: The more you practise, the better you get. The higher we climbed, the colder it became. The harder the task, the greater the reward. Both halves contain a comparative, and the second half describes the result of the first.

Repeating a comparative joined by “and” describes a continuous or increasing change over time. It is getting colder and colder means the temperature keeps dropping. With longer adjectives we repeat “more”: The exam became more and more difficult. This pattern is common when describing trends, gradual processes, or situations that keep intensifying.

No. We use “than” only when we mention the second thing in the comparison: She is taller than her sister. If the second thing is already clear from context, we can leave it out: I wanted a bigger one. (bigger than the one I have). After “than” we can use an object pronoun in everyday English (taller than me) or, in formal writing, a subject pronoun with a verb (taller than I am).

Adverbs follow similar rules. Short adverbs that look like adjectives add -er (fast → faster, hard → harder). Adverbs ending in -ly use more (more quickly, more carefully). For example: She drives more carefully than her brother. He finished faster than everyone else. Some are irregular: well → better, badly → worse. The as…as structure also works with adverbs: He works as efficiently as she does.

Both express a smaller degree, but they sound different in everyday English. “Not as…as” is the most natural choice in speech: This book is not as interesting as the first one. “Less” plus an adjective (less interesting) is more formal and is mainly used with longer adjectives, not short ones — we rarely say “less tall”, preferring “not as tall” or “shorter”. Both are correct, but “not as…as” is generally safer and more common.