Comparison

Comparison
COMPARATIVE AND SUPERLATIVE ADJECTIVES
If you want to compare two things, you use the comparative form of an adjective. For example the comparative form of big is bigger, and the comparative form of interesting is more interesting.
Your car is bigger than mine.
His new book is more interesting than his last one.

If you want to say that one thing is bigger, faster, more interesting etc than all the others of a group of things, you use the superlative form of an adjective. For example, the superlative form of big is biggest, and the superlative form of interesting is the most interesting.
It’s the fastest motorcycle in the world.
What’s the most delicious food you’ve ever eaten?

CHOOSING THE RIGHT FORM OF THE ADJECTIVE
If the adjective is one syllable long, you add ‑er or ‑est to it, sometimes making a change in the spelling.
adjective comparative superlative
tall taller tallest
big bigger biggest
nice nicer nicest

If the adjective is three or more syllables long, you add the words more or most before it.
That’s a more interesting question.
Kim’s question was the most interesting one.
The new trains are more comfortable than the old ones.
That’s the most comfortable bed I’ve ever slept in.

Most adjectives with two syllables use more and most to form the comparative and superlative, but some two‑syllable adjectives have ‑er/‑est endings, and some two-syllable adjectives use both methods.

The ‑er/‑est endings are possible with adjectives ending in ‑y, ‑ow, ‑le, ‑er, ‑ure. Don’t forget that with adjectives that end in ‑y, the ‑y changes to ‑i.
adjective comparative superlative
happy happier happiest
gentle gentler gentlest
narrow narrower Narrowest
clever cleverer cleverest


You keep this pattern even in the cases where you can add un‑ to a two-syllable adjective.

unhappier/unhappiest
Proper and eager do not follow this rule: you can use only more/most with them.
You use more/most with all other two‑syllable adjectives.
more/most active more/most useful more/most recent

ADJECTIVES THAT DO NOT FOLLOW THE NORMAL RULES
Not all adjectives follow the normal rules. Some adjectives have completely irregular forms. The most common ones are:
adjective comparative superlative
good better best
bad worse worst
little less least

Words which are formed from a verb, and which end in ‑ing, ‑ed, or other past forms, always use more/most, no matter how many syllables they have.
His latest film is even more boring than his previous ones.
She was more shocked than I was.

COMPARING TWO THINGS WHICH ARE THE SAME
If you want to say that two things are the same size, the same height etc, you can say that one thing is as big as the other, as tall as the other etc.
She’s as tall as her sister.
Do you think this summer will be as hot as last summer?

COMPARING TWO THINGS WHICH ARE NOT THE SAME
If you want to say that two things are not the same size, the same height etc, you can say that one thing is not as big as the other, not as tall as the other etc.
The meal wasn’t as good as the last meal I had there.
I’m not as fat as him. OR I’m not as fat as he is.
London is not as expensive as some other European cities.


You can use less ... than to mean the same thing as not as ... as, but you usually use it with adjectives that have two or more syllables, for example less expensive, less important.

Value for money is less important than quality and reliability.

Don’t use less with short adjectives such as good, old etc.

You can leave out the second as and the noun after it, if you have already mentioned or suggested the second thing that you are comparing.

The material looks like silk, but it’s not as expensive. (="not" as expensive as silk)

Similarly, you can also leave out the than part of the comparison when you are using less, if you have already mentioned or suggested the second thing that you are comparing.
I prefer the old Hollywood movies. They’re much less violent. (="than" modern films)
The buses are less crowded after 10 o’clock. (="than" they are before 10 o’clock)

If you want to say that one type of thing is less expensive, less important etc than all other things of the same type, you can say that it is the least expensive, the least important etc.
People usually choose the least expensive brand.
Don’t use least with short adjectives such as good, old etc.