| singular | plural |
| Infinitive | | |
| intervene | |
| present simple | | |
| 1 | I intervene | we intervene |
| 2 | you intervene | you intervene |
| 3 | he/she/it intervenes | they intervene |
| past simple | | |
| 1 | I intervened | we intervened |
| 2 | you intervened | you intervened |
| 3 | he/she/it intervened | they intervened |
| future simple | | |
| 1 | I will/shall intervene | we will/shall intervene |
| 2 | you will/shall intervene | you will/shall intervene |
| 3 | he/she/it will/shall intervene | they will/shall intervene |
| conditional simple | | |
| 1 | I would intervene | we would intervene |
| 2 | you would intervene | you would intervene |
| 3 | he/she/it would intervene | they would intervene |
| present continuous | | |
| 1 | I am intervening | we are intervening |
| 2 | you are intervening | you are intervening |
| 3 | he/she/it is intervening | they are intervening |
| past continuous | | |
| 1 | I was intervening | we were intervening |
| 2 | you were intervening | you were intervening |
| 3 | he/she/it was intervening | they were intervening |
| future continuous | | |
| 1 | I will be intervening | we will be intervening |
| 2 | you will be intervening | you will be intervening |
| 3 | he/she/it will be intervening | they will be intervening |
| conditional continuous | | |
| 1 | I would be intervening | we would be intervening |
| 2 | you would be intervening | you would be intervening |
| 3 | he/she/it would be intervening | they would be intervening |
| present perfect | | |
| 1 | I have intervened | we have intervened |
| 2 | you have intervened | you have intervened |
| 3 | he/she/it has intervened | they have intervened |
| past perfect | | |
| 1 | I had intervened | we had intervened |
| 2 | you had intervened | you had intervened |
| 3 | he/she/it had intervened | they had intervened |
| future perfect | | |
| 1 | I will have intervened | we will have intervened |
| 2 | you will have intervened | you will have intervened |
| 3 | he/she/it will have intervened | they will have intervened |
| conditional perfect | | |
| 1 | I would have intervened | we would have intervened |
| 2 | you would have intervened | you would have intervened |
| 3 | he/she/it would have intervened | they would have intervened |
