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