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serious
| Form | Japanese |
|---|---|
| て-form | じゅうだいで |
| Past (casual) | じゅうだいだった |
| Past (polite) | じゅうだいでした |
| Negative (casual) | じゅうだいじゃない |
| Negative (polite) | じゅうだいじゃないです |
| Conditional (たら) | じゅうだいだったら |
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