| I | occur | |
|---|---|---|
| you | occur | |
| he/she/it | occurs | |
| we | occur | |
| you | occur | |
| they | occur |
| I | occurred | |
|---|---|---|
| you | occurred | |
| he/she/it | occurred | |
| we | occurred | |
| you | occurred | |
| they | occurred |
| I | have | occurred | |
|---|---|---|---|
| you | have | occurred | |
| he/she/it | has | occurred | |
| we | have | occurred | |
| you | have | occurred | |
| they | have | occurred |
| I | had | occurred | |
|---|---|---|---|
| you | had | occurred | |
| he/she/it | had | occurred | |
| we | had | occurred | |
| you | had | occurred | |
| they | had | occurred |