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appropriate
| Form | Japanese |
|---|---|
| て-form | てきせつで |
| Past (casual) | てきせつだった |
| Past (polite) | てきせつでした |
| Negative (casual) | てきせつじゃない |
| Negative (polite) | てきせつじゃないです |
| Conditional (たら) | てきせつだったら |
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