
Regular verb: alter - altered - altered
Present | Present continuous | Preterite | Preterite continuous | 
| I alter you alter she alters we alter you alter they alter  | I am altering you are altering she is altering we are altering you are altering they are altering  | I altered you altered she altered we altered you altered they altered  | I was altering you were altering she was altering we were altering you were altering they were altering  | 
Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous | 
| I have altered you have altered she has altered we have altered you have altered they have altered  | I have been altering you have been altering she has been altering we have been altering you have been altering they have been altering  | I had altered you had altered she had altered we had altered you had altered they had altered  | I had been altering you had been altering she had been altering we had been altering you had been altering they had been altering  | 
Future | Future continuous | Future perfect | Future perfect continuous | 
| I will alter you will alter she will alter we will alter you will alter they will alter  | I will be altering you will be altering she will be altering we will be altering you will be altering they will be altering  | I will have altered you will have altered she will have altered we will have altered you will have altered they will have altered  | I will have been altering you will have been altering she will have been altering we will have been altering you will have been altering they will have been altering  | 
Present | Present continuous | Past | Past continuous | 
| I would alter you would alter she would alter we would alter you would alter they would alter  | I would be altering you would be altering she would be altering we would be altering you would be altering they would be altering  | I would have altered you would have altered she would have altered we would have altered you would have altered they would have altered  | I would have been altering you would have been altering she would have been altering we would have been altering you would have been altering they would have been altering  | 
Infinitive | Imperative | 
Infinitive | Imperative | ||
| to alter | alter Let's alter alter  | 
Present | Past | ||
| altering | altered |