GrammarJLPT N5
→ nonexistent
Nonexistent / Negation
JLPT N5Auxiliary verbNeutral
ない is one of the most fundamental words in Japanese and serves multiple closely related roles. As a standalone i-adjective, ない means 'nonexistent' or 'there is not,' functioning as the negative counterpart of ある. It indicates that something does not exist, is not present, or is not possessed. Beyond this independent use, ない also attaches to the negative stem (あ-stem) of verbs to form their plain negative conjugation, such as 食べない (do not eat) or 行かない (do not go). Because ない is grammatically an i-adjective in both its standalone and auxiliary uses, it conjugates like one: its past form is なかった, its te-form is なくて, and its adverbial form is なく. Learners should be careful not to confuse the standalone adjective ない (nonexistent) with the auxiliary ない that negates verbs, even though they share the same form and conjugation pattern. The polite equivalents are ありません for the standalone use and verb stem + ません for verb negation.
Functions
#1 Expressing nonexistence
Structure
Noun + が / は + ない
今日は時間がない。
Here ない functions as a standalone i-adjective meaning 'nonexistent' or 'there is not.' It is the negative counterpart of ある and indicates that the noun before が does not exist or is not available. In this sentence, 時間がない simply states that time does not exist (is not available) today.There is no time today.
Structures
- Standalone (nonexistence / not having)
- Noun + が + ない / Noun + は + ない
- Verb negation (auxiliary)
- Verb (あ-stem / negative stem) + ない
Common mistakes
A very common mistake is confusing the standalone adjective ない (nonexistent) with the auxiliary ない that negates verbs; while they look the same and conjugate the same way, their grammatical roles differ, which matters when analyzing sentences. Another frequent error involves godan verbs ending in う: learners often produce incorrect forms like 買あない instead of the correct 買わない, forgetting that the あ-stem of う-ending verbs uses わ, not あ. Additionally, beginners sometimes use ない to negate nouns directly (e.g., 学生ない), when the correct form is じゃない or ではない after nouns and na-adjectives. Finally, learners may mix up ない (for inanimate things) with いない (the negative of いる, for animate beings), saying 猫がない instead of the correct 猫がいない.
Related
あるいないなくてませんずじゃない