Comparatives and superlative of adjectives

We use comparative adjectives to show change or make comparisons:

This car is certainly better, but it's much more expensive.
I'm feeling happier now.
We need a bigger garden.

We use than when we want to compare one thing with another:

She is two years older than me.
Sonsonate is much bigger than Usulután. 
He is a better player than Magico González 

Costa rica is a bigger country than El Salvador.

When we want to describe how something or someone changes we can use two comparatives with and:

The balloon got bigger and bigger.
Everything is getting more and more expensive.
Grandfather is looking older and older.