Present
| I | occur |
| You | occur |
| She | occurs |
| We | occur |
| They | occur |
Past
| I | occurred |
| You | occurred |
| She | occurred |
| We | occurred |
| They | occurred |
Perfect
| I | have | occurred |
| You | have | occurred |
| She | has | occurred |
| We | have | occurred |
| They | have | occurred |
Future
| I | will | occur |
| You | will | occur |
| She | will | occur |
| We | will | occur |
| They | will | occur |
Past Perfect
| I | had | occurred |
| You | had | occurred |
| She | had | occurred |
| We | had | occurred |
| They | had | occurred |
Future Perfect
| I | will | have | occurred |
| You | will | have | occurred |
| She | will | have | occurred |
| We | will | have | occurred |
| They | will | have | occurred |
Present - Conditional
| I | would | occur |
| You | would | occur |
| She | would | occur |
| We | would | occur |
| They | would | occur |
Perfect - Conditional
| I | would | have | occurred |
| You | would | have | occurred |
| She | would | have | occurred |
| We | would | have | occurred |
| They | would | have | occurred |