Negation

Japanese negates by conjugating the verb, not by adding a word. There is no Japanese "not" that floats in the sentence: the negative is a suffix, and it behaves exactly like the machine in Present tense.

The suffix is (a)nai

tabe  + (a)nai  →  tabenai    食べない   don't eat
nom*  + (a)nai  →  nomanai    飲まない   don't drink
kak*  + (a)nai  →  kakanai    書かない   don't write

Same rule as before: the bracketed vowel only surfaces on a consonant stem. Polite negative swaps the suffix, not the logic: (i)masen → 食べません tabemasen, 飲みません nomimasen.

The one place a letter is inserted

A handful of consonant stems end in the old w, which modern Japanese only pronounces before a:

ka(w)* + (a)nai  →  kawanai   買わない   don't buy   (not *kaanai)
i(w)*  + (a)nai  →  iwanai    言わない   don't say

The w is not an exception the language invented to annoy you; it is a consonant that survives in exactly one environment. Everywhere else it is silent: 買います kaimasu, 買う kau.

Negatives conjugate like adjectives

Once you have ない, treat it as an い-adjective — because that is what it is:

That -katta ending is the ordinary い-adjective past (see Adjectives). Nothing new to learn.

ない vs ありません vs いません

The verb "to be" splits by animacy, and the negative of ある is the irregular ない — never aranai.

Negative questions expect "yes"

行きませんか？ ikimasen ka? — Won't you go? → an invitation, not a doubt.

And the answer flips relative to English:

コーヒーを飲みませんか？ — Won't you have a coffee? はい、飲みません — Yes, I won't. (English: "No, I won't.")

はい/いいえ answer whether the statement is right, not whether the action happens. This trips up every English speaker at least once.

Softening: the real "no"

A flat いいえ is blunt. Japanese refuses by trailing off:

ちょっと… chotto… — "a bit…" (and nothing follows) 難しいですね muzukashii desu ne — "that's difficult, isn't it" = no 大丈夫です daijōbu desu — "I'm fine" = no thank you

Hearing 大丈夫です as a refusal rather than an acceptance is a genuine milestone.

Other negative words

Like Spanish and Italian, the negative word needs the verb to be negative too: 何も食べない. Unlike English, that is not a double negative — it is agreement.

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