Grammar rules:
We use superlative adjectives to show that something is the most in a group (number one).
For short adjectives, add -est:
long - the longest
hot - the hottest
easy - the easiest
For long adjectives, use ''the most + adjective'':
the most beautiful
the most difficult
the most expensive
Some words are irregular:
good - the best
bad - the worst
far - the furthest/farthest
Use ''the'' before the superlative:
the best day
the most interesting movie