
Regular verb: prevent - prevented - prevented
Present | Present continuous | Preterite | Preterite continuous | 
|  do I prevent? do you prevent? does she prevent? do we prevent? do you prevent? do they prevent?  |  am I preventing? are you preventing? is she preventing? are we preventing? are you preventing? are they preventing?  | did I prevent? did you prevent? did she prevent? did we prevent? did you prevent? did they prevent?  |  was I preventing? were you preventing? was she preventing? were we preventing? were you preventing? were they preventing?  | 
Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous | 
|  have I prevented? have you prevented? has she prevented? have we prevented? have you prevented? have they prevented?  |  have I been preventing? have you been preventing? has she been preventing? have we been preventing? have you been preventing? have they been preventing?  | had I prevented? had you prevented? had she prevented? had we prevented? had you prevented? had they prevented?  | had I been preventing? had you been preventing? had she been preventing? had we been preventing? had you been preventing? had they been preventing?  | 
Future | Future continuous | Future perfect | Future perfect continuous | 
|  will I prevent? will you prevent? will she prevent? will we prevent? will you prevent? will they prevent?  |  will I be preventing? will you be preventing? will she be preventing? will we be preventing? will you be preventing? will they be preventing?  |  will I have prevented? will you have prevented? will she have prevented? will we have prevented? will you have prevented? will they have prevented?  |  will I have been preventing? will you have been preventing? will she have been preventing? will we have been preventing? will you have been preventing? will they have been preventing?  | 
Present | Present continuous | Past | Past continuous | 
|  would I prevent? would you prevent? would she prevent? would we prevent? would you prevent? would they prevent?  |  would I be preventing? would you be preventing? would she be preventing? would we be preventing? would you be preventing? would they be preventing?  |  would I have prevented? would you have prevented? would she have prevented? would we have prevented? would you have prevented? would they have prevented?  |  would I have been preventing? would you have been preventing? would she have been preventing? would we have been preventing? would you have been preventing? would they have been preventing?  | 
Infinitive | Imperative | 
Infinitive | Imperative | ||
| to prevent | - - -  | 
Present | Past | ||
| preventing | prevented |