Can 無い be conjugated?

Question

Like any other i-adjective, they can be conjugated but I read a few example sentences of the i-adjective "無い" and I can't find any sentences where it was conjugated.

Answer 1

Yes ない conjugates like any other i-adjectives do.

• 大きくなかった。 It was not big.
• リンゴはなかった。 There were no apples.
• 高くなくて、安くもない。 It is neither expensive nor cheap.

The ku-form (aka adverb form) is sometimes used, too, but it usually sounds slightly awkward:

• [?] 美しくなく踊った。 He danced not beautifully.

Answer 2

You can check out this pretty thorough listing of ない conjugations here.

According to the link:

• ない is the Terminal form as well as the Attributive form.
• なく is the Continuative form as well as the Adverbial construction.
• なかろ is the Imperfective form.
• なけれ is the Hypothetical form.
• なかれ is the Imperative form.
• なくない is the Informal Negative construction.
• なかった is the Informal Past construction.
• なくなかった is the Informal Negative Past construction.
• ないです is the Formal construction.
• なくないです is the Formal Negative construction.
• なかったです is the Formal Past construction.
• なくなかったです is the Formal Negative Past construction.
• なくて is the Conjunctive construction.
• なければ is the Conditional construction.
• なかったら is the Provisional construction.
• なかろう is the Volitional construction.
• なさ is the Degree construction.

As you can see, there are many ways to conjugate this adjective. If you wish, I can expand on this answer.