| I | subserve |
|---|---|
| you | subserve |
| he/she/it | subserves |
| we | subserve |
| you | subserve |
| they | subserve |
| I | subserved |
|---|---|
| you | subserved |
| he/she/it | subserved |
| we | subserved |
| you | subserved |
| they | subserved |
| I | have | subserved |
|---|---|---|
| you | have | subserved |
| he/she/it | has | subserved |
| we | have | subserved |
| you | have | subserved |
| they | have | subserved |
| I | had | subserved |
|---|---|---|
| you | had | subserved |
| he/she/it | had | subserved |
| we | had | subserved |
| you | had | subserved |
| they | had | subserved |
无例句可用
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