変質する · noun or participle which takes 'suru'
| Form | Positive | Negative |
|---|---|---|
| Dictionary | 変質する | 変質しない |
| Polite | 変質します | 変質しません |
| Past polite | 変質しました | 変質しませんでした |
| Past | 変質した | 変質しなかった |
| Te-form | 変質して | 変質しないで |
| Desire | 変質したい | 変質したくない |
| Potential | 変質できる | 変質できない |
| Passive | 変質される | 変質されない |
| Causative | 変質させる | 変質させない |
| Causative passive | 変質させられる | 変質させられない |
| Volitional | 変質しよう | |
| Polite volitional | 変質しましょう | |
| Imperative | 変質しろ | 変質するな |
| Conditional | 変質すれば | 変質しなければ |
| Tara conditional | 変質したら | 変質しなかったら |
noun, noun or participle which takes 'suru', intransitive verb
change in quality; alteration; deterioration
Refers to a fundamental change in the nature, quality, or character of something, often with a negative connotation of degradation or spoilage. Used for physical substances, abstract qualities, and personal character.
The oil deteriorated after long-term storage.
His character changed for the worse after he became successful.
Specifically refers to abnormal or deviant sexual behavior or tendencies. Often used in psychological or legal contexts.
He was arrested by the police as a sexual pervert.
If left out too long, the food deteriorates in quality.
As he gained power, his character became twisted.
High temperatures cause the oil to deteriorate.