| I | unbutton |
|---|---|
| you | unbutton |
| he/she/it | unbuttons |
| we | unbutton |
| you | unbutton |
| they | unbutton |
| I | unbuttoned |
|---|---|
| you | unbuttoned |
| he/she/it | unbuttoned |
| we | unbuttoned |
| you | unbuttoned |
| they | unbuttoned |
| I | have | unbuttoned |
|---|---|---|
| you | have | unbuttoned |
| he/she/it | has | unbuttoned |
| we | have | unbuttoned |
| you | have | unbuttoned |
| they | have | unbuttoned |
| I | had | unbuttoned |
|---|---|---|
| you | had | unbuttoned |
| he/she/it | had | unbuttoned |
| we | had | unbuttoned |
| you | had | unbuttoned |
| they | had | unbuttoned |
无例句可用
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