| Simple | Progressive | Perfect | Progressive |
| Present |
| I alter |
| you alter |
| he/she/it alters |
| we alter |
| you all alter |
| they alter |
|
| I am altering |
| you are altering |
| he/she/it is altering |
| we are altering |
| you all are altering |
| they are altering |
|
| I have altered |
| you have altered |
| he/she/it has altered |
| we have altered |
| you all have altered |
| they have altered |
|
| I have been altering |
| you have been altering |
| he/she/it has been altering |
| we have been altering |
| you all have been altering |
| they have been altering |
|
| Past |
| I altered |
| you altered |
| he/she/it altered |
| we altered |
| you all altered |
| they altered |
|
| I was altering |
| you were altering |
| he/she/it was altering |
| we were altering |
| you all were altering |
| they were altering |
|
| I had altered |
| you had altered |
| he/she/it had altered |
| we had altered |
| you all had altered |
| they had altered |
|
| I had been altering |
| you had been altering |
| he/she/it had been altering |
| we had been altering |
| you all had been altering |
| they had been altering |
|
| Future |
| I will alter |
| you will alter |
| he/she/it will alter |
| we will alter |
| you all will alter |
| they will alter |
|
| I will be altering |
| you will be altering |
| he/she/it will be altering |
| we are altering |
| you all will be altering |
| they will be altering |
|
| I will have altered |
| you will have altered |
| he/she/it will have altered |
| we will have altered |
| you all will have altered |
| they will have altered |
|
| I will have been altering |
| you will have been altering |
| he/she/it will have been altering |
| we will have been altering |
| you all will have been altering |
| they will have been altering |
|
