Present
| I | intervene |
| You | intervene |
| She | intervenes |
| We | intervene |
| They | intervene |
Past
| I | intervened |
| You | intervened |
| She | intervened |
| We | intervened |
| They | intervened |
Perfect
| I | have | intervened |
| You | have | intervened |
| She | has | intervened |
| We | have | intervened |
| They | have | intervened |
Future
| I | will | intervene |
| You | will | intervene |
| She | will | intervene |
| We | will | intervene |
| They | will | intervene |
Past Perfect
| I | had | intervened |
| You | had | intervened |
| She | had | intervened |
| We | had | intervened |
| They | had | intervened |
Future Perfect
| I | will | have | intervened |
| You | will | have | intervened |
| She | will | have | intervened |
| We | will | have | intervened |
| They | will | have | intervened |
Present - Conditional
| I | would | intervene |
| You | would | intervene |
| She | would | intervene |
| We | would | intervene |
| They | would | intervene |
Perfect - Conditional
| I | would | have | intervened |
| You | would | have | intervened |
| She | would | have | intervened |
| We | would | have | intervened |
| They | would | have | intervened |