良質 (ryoushitsu) conjugation
good quality, superior quality
良質 (りょうしつ, ryoushitsu) is a na-adjective. Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 良質だ ryoushitsuda | 良質です ryoushitsudesu | The form you look up. Also the casual “is ~”. |
| Negative | 良質じゃない ryoushitsujanai | 良質じゃないです ryoushitsujanaidesu | “is not ~”. |
| Past | 良質だった ryoushitsudatta | 良質でした ryoushitsudeshita | “was ~”. |
| Past negative | 良質じゃなかった ryoushitsujanakatta | 良質じゃなかったです ryoushitsujanakattadesu | “was not ~”. |
| Te-form | 良質で ryoushitsude | — | Links to the next clause: “~ and …”. |
| Adverb | 良質に ryoushitsuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 良質な〜 ryoushitsuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 良質なら ryoushitsunara | — | “if it is ~”. |
| Conditional (~たら) | 良質だったら ryoushitsudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 良質になる ryoushitsuninaru | 良質になります ryoushitsuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 良質すぎる ryoushitsusugiru | 良質すぎます ryoushitsusugimasu | “too ~”. |
| Looks ~ (~そう) | 良質そう ryoushitsusou | 良質そうです ryoushitsusoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
See the full rules in the adjective conjugation guide.