Na-Adjectives and I-Adjectives

"Na" adjectives behave just like nouns, and are "conjugated" the same way.
See my post "Nouns" for reference.

	Positive	Negative
Present	だ	じゃない
Past	だった	じゃなかった

You put these after them, to use them like objects, i.e. "[the|this|that] (noun) is (adj)"

The sky is blue.
空が青です。

They are adjectives, though. And they describe. You can place them before the noun. If you use the present positive (plain) form, you put な(na) before them.

I like the big sky.
私はビッグな空を気に入る。




I-adjectives end in い. You conjugate them like this:

	Positive	Negative
Present	い	くない
Past	かった	くなかった

NOTE: You CANNOT use them with だ / です . If you use them like "(noun) is (adj)", but you just put it after the noun; you don't put da/desu at the end.

The building is tall.
高いビル。

The building was not tall.
高くなかったビル。

They can be used in combination with nouns, too, like so:

I like the blue sky.
私は青空気に入る。