Rules for comparing adjectives.
Rule 1: Usually we just add ‘er’ and ‘est’ to adjectives when we are using comparisons.
For example: tall, taller, tallest and fast, faster, fastest
Rule 2: If the adjective ends with a vowel then a consonant, we need to double the last letter
before adding ‘er’ and ‘est’.
For example: big, bigger, biggest and sad, sadder, saddest
Rule 3: If the adjective ends in ‘y’, we change ‘y’ to ‘i’, then add ‘er’ and ‘est’.
For example: scary, scarier, scariest and happy, happier, happiest
Rule 4: Sometimes we don’t add ‘er’ and ‘est’ – we put ‘more’ and ‘most’ before the adjective we are comparing.
For example: beautiful, more beautiful, most beautiful
terrifying, more terrifying, most terrifying