Comparative and Superlative Adjectives

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To make the comparative form of adjectives (like 'bigger' or 'more expensive') and the superlative form (like 'biggest' or 'most expensive'), first we need to know how many syllables are in the adjective.

Adjectives with one syllable

Usually if an adjective has only one syllable, we add 'er' to make the comparative form. We add 'est' to make the superlative form. There are some spelling changes. If there is one vowel followed by one consonant at the end of the adjective, we often double the consonant. If the adjective ends in 'y', this often changes to 'i'. If the adjective ends in 'e', we don't add another 'e', just 'r'. Even when the adjective has only one syllable, it's still not wrong to use 'more' or 'most'. It's possible to say 'more wet' or 'most tall'. This isn't incorrect.

There are a few adjectives that we have to use 'more' or 'most' with, even though they only have one syllable. We CAN'T add 'er' or 'est'. Adjectives with two syllables

For adjectives with two syllables we generally use 'more' or 'most'. But some two syllable adjectives can take 'er' or 'est'. It's also fine to use 'more' (for the comparative) or 'most' (for the superlative). Adjectives with two syllables that end in 'y' usually can add 'er' or 'est' (y generally changes to i). It's also fine to use 'more' or 'most'. Adjectives with more than two syllables

Adjectives with more than two syllables can only make their comparative by using 'more' and their superlative by using 'most'. Irregular adjectives

There are also some irregular adjectives. We just need to learn these forms. Try an exercise about making the comparative here.

Read about how to use comparative adjectives here.
Read about how to use superlative adjectives here.