| Simple | Progressive | Perfect | Progressive |
| Present |
| I prevent |
| you prevent |
| he/she/it prevents |
| we prevent |
| you all prevent |
| they prevent |
|
| I am preventing |
| you are preventing |
| he/she/it is preventing |
| we are preventing |
| you all are preventing |
| they are preventing |
|
| I have prevented |
| you have prevented |
| he/she/it has prevented |
| we have prevented |
| you all have prevented |
| they have prevented |
|
| I have been preventing |
| you have been preventing |
| he/she/it has been preventing |
| we have been preventing |
| you all have been preventing |
| they have been preventing |
|
| Past |
| I prevented |
| you prevented |
| he/she/it prevented |
| we prevented |
| you all prevented |
| they prevented |
|
| I was preventing |
| you were preventing |
| he/she/it was preventing |
| we were preventing |
| you all were preventing |
| they were preventing |
|
| I had prevented |
| you had prevented |
| he/she/it had prevented |
| we had prevented |
| you all had prevented |
| they had prevented |
|
| I had been preventing |
| you had been preventing |
| he/she/it had been preventing |
| we had been preventing |
| you all had been preventing |
| they had been preventing |
|
| Future |
| I will prevent |
| you will prevent |
| he/she/it will prevent |
| we will prevent |
| you all will prevent |
| they will prevent |
|
| I will be preventing |
| you will be preventing |
| he/she/it will be preventing |
| we are preventing |
| you all will be preventing |
| they will be preventing |
|
| I will have prevented |
| you will have prevented |
| he/she/it will have prevented |
| we will have prevented |
| you all will have prevented |
| they will have prevented |
|
| I will have been preventing |
| you will have been preventing |
| he/she/it will have been preventing |
| we will have been preventing |
| you all will have been preventing |
| they will have been preventing |
|
