| I | unscrew |
|---|---|
| you | unscrew |
| he/she/it | unscrews |
| we | unscrew |
| you | unscrew |
| they | unscrew |
| I | unscrewed |
|---|---|
| you | unscrewed |
| he/she/it | unscrewed |
| we | unscrewed |
| you | unscrewed |
| they | unscrewed |
| I | have | unscrewed |
|---|---|---|
| you | have | unscrewed |
| he/she/it | has | unscrewed |
| we | have | unscrewed |
| you | have | unscrewed |
| they | have | unscrewed |
| I | had | unscrewed |
|---|---|---|
| you | had | unscrewed |
| he/she/it | had | unscrewed |
| we | had | unscrewed |
| you | had | unscrewed |
| they | had | unscrewed |
无例句可用
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