Superlatives of adjectives - 1

In the superlative you talk about one thing only and how it is the best, worst, etc.
You do not compare two things. The following guidelines apply to the superlative:

Adjectives with one syllable:
1-syllable adjectives: add -est to the adjective (plus the)

My sister is the tallest in our family.
Yesterday was the coldest day of the year so far.


Note: If the word ends: consonant-vowel-consonant, then the last consonant is usually doubled in the superlative.
big - biggest, fat - fattest, hot - hottest

Adjectives of two syllables ending in -y:
2-syllable adjectives ending in -y: change the -y to -iest (plus the)

The richest people are not always the happiest.
Which do you think is the easiest language to learn?
She's the luckiest person I know.