安い (yasui) conjugation
inexpensive; cheap (things)
安い (やすい, yasui) is an i-adjective. I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 安い yasui | 安いです yasuidesu | The form you look up. Also the casual “is ~”. |
| Negative | 安くない yasukunai | 安くないです yasukunaidesu | “is not ~”. |
| Past | 安かった yasukatta | 安かったです yasukattadesu | “was ~”. |
| Past negative | 安くなかった yasukunakatta | 安くなかったです yasukunakattadesu | “was not ~”. |
| Te-form | 安くて yasukute | — | Links to the next clause: “~ and …”. |
| Adverb | 安く yasuku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 安い〜 yasui〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 安ければ yasukereba | — | “if it is ~”. |
| Conditional (~たら) | 安かったら yasukattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 安くなる yasukunaru | 安くなります yasukunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 安すぎる yasusugiru | 安すぎます yasusugimasu | “too ~”. |
| Looks ~ (~そう) | 安そう yasusou | 安そうです yasusoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
See the full rules in the adjective conjugation guide.