| Simple | Progressive | Perfect | Progressive |
| Present |
| I forewarn |
| you forewarn |
| he/she/it forewarns |
| we forewarn |
| you all forewarn |
| they forewarn |
|
| I am forewarning |
| you are forewarning |
| he/she/it is forewarning |
| we are forewarning |
| you all are forewarning |
| they are forewarning |
|
| I have forewarned |
| you have forewarned |
| he/she/it has forewarned |
| we have forewarned |
| you all have forewarned |
| they have forewarned |
|
| I have been forewarning |
| you have been forewarning |
| he/she/it has been forewarning |
| we have been forewarning |
| you all have been forewarning |
| they have been forewarning |
|
| Past |
| I forewarned |
| you forewarned |
| he/she/it forewarned |
| we forewarned |
| you all forewarned |
| they forewarned |
|
| I was forewarning |
| you were forewarning |
| he/she/it was forewarning |
| we were forewarning |
| you all were forewarning |
| they were forewarning |
|
| I had forewarned |
| you had forewarned |
| he/she/it had forewarned |
| we had forewarned |
| you all had forewarned |
| they had forewarned |
|
| I had been forewarning |
| you had been forewarning |
| he/she/it had been forewarning |
| we had been forewarning |
| you all had been forewarning |
| they had been forewarning |
|
| Future |
| I will forewarn |
| you will forewarn |
| he/she/it will forewarn |
| we will forewarn |
| you all will forewarn |
| they will forewarn |
|
| I will be forewarning |
| you will be forewarning |
| he/she/it will be forewarning |
| we are forewarning |
| you all will be forewarning |
| they will be forewarning |
|
| I will have forewarned |
| you will have forewarned |
| he/she/it will have forewarned |
| we will have forewarned |
| you all will have forewarned |
| they will have forewarned |
|
| I will have been forewarning |
| you will have been forewarning |
| he/she/it will have been forewarning |
| we will have been forewarning |
| you all will have been forewarning |
| they will have been forewarning |
|
