We use comparative adjectives to show change or make comparisons:
When we want to describe how somwthing or someone changes we can use two comparatives with and:
We use than when we want to compare one thing with another:
I'm feeling happier now.
We need a bigger garden.
She is two years older than me.
New York is much bigger than Boston.
The balloon got bigger and bigger.
Everything is getting more and more expensive.
We often use the with comparative adjectives to show that one thing depends on another:
The faster you drive, the more dangerous it is.
(= When you drive faster, it is more dangerous.)
We use the with superlative adjectives:
It was the happiest day of my life.
Everest is the highest mountain in the world.
That’s the best film I have seen this year.
I have three sisters: Jan is the oldest and Angela is the youngest.