The superlative is the greatest form of an adjective and is used when you are comparing more than one thing.
In general, we use an adjective + -est for short words (regular superlatives e.g. long + -est = longest) and most + an adjective for longer words (regular superlatives e.g. most + famous = most famous).
Remember that with short words ending in a single consonant, the consonant must be doubled before adding –est, words that end in 'y', change the 'y' to 'i' before adding –est and words that end in '-ed', '-ful', '-ing' and '-less' always use 'most'.
There are also irregular superlatives e.g. good – best or bad – worst.
Lastly, we normally use the before a superlative e.g. the longest, the most famous, etc. Use in after superlatives when talking about places, organizations or groups of people and periods of time.
