There are two types of adjectives in Japanese, い-adjectives and な-adjectives.
These adjectives behave in a different way.
In this lesson you will learn two adjectives, 大きい(ookii), which means big, and きれい, which means pretty.
大きい is an い-adjective, and きれい is a な-adjective.
When used after a noun, there is no difference between these two kinds of adjectives, as you can see below.
The car is big.
車は大きいです。 kuruma ha ookii desu.
Am I pretty?
私はきれいですか？ watasi ha kirei desu ka?
When used in front of a noun, な-adjectives end in な.
This is why な-adjectives are called な-adjectives.
That is a big tree!
それは大きい木です！ sore ha ookii ki desu!
Japan is a beautiful country.
日本はきれいな国です。 nihon ha kireina kuni desu.
い-adjectives don't change when used in front of a noun.
All い-adjectives end in い, but not all adjectives ending in い are い-adjectives.
Otherwise きれい would also be an い-adjective, which it is not.
You don't have to worry about remembering whether each adjective you learn is an い-adjective or a な-adjective.
We will make sure to use each adjective we teach in a sentence in such a way that you will know and remember.