| I | certify | |
|---|---|---|
| you | certify | |
| he/she/it | certifies | |
| we | certify | |
| you | certify | |
| they | certify |
| I | certified | |
|---|---|---|
| you | certified | |
| he/she/it | certified | |
| we | certified | |
| you | certified | |
| they | certified |
| I | have | certified | |
|---|---|---|---|
| you | have | certified | |
| he/she/it | has | certified | |
| we | have | certified | |
| you | have | certified | |
| they | have | certified |
| I | had | certified | |
|---|---|---|---|
| you | had | certified | |
| he/she/it | had | certified | |
| we | had | certified | |
| you | had | certified | |
| they | had | certified |