I alter you alter she alters we alter you alter they alter
Present continuous
I am altering you are altering she is altering we are altering you are altering they are altering
Preterite
I altered you altered she altered we altered you altered they altered
Preterite continuous
I was altering you were altering she was altering we were altering you were altering they were altering
Present perfect
I have altered you have altered she has altered we have altered you have altered they have altered
Present perfect continuous
I have been altering you have been altering she has been altering we have been altering you have been altering they have been altering
Pluperfect
I had altered you had altered she had altered we had altered you had altered they had altered
Pluperfect continuous
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
I will alter you will alter she will alter we will alter you will alter they will alter
Future continuous
I will be altering you will be altering she will be altering we will be altering you will be altering they will be altering
Future perfect
I will have altered you will have altered she will have altered we will have altered you will have altered they will have altered
Future perfect continuous
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
Conditional
Present
I would alter you would alter she would alter we would alter you would alter they would alter
Present continuous
I would be altering you would be altering she would be altering we would be altering you would be altering they would be altering
Past
I would have altered you would have altered she would have altered we would have altered you would have altered they would have altered
Past continuous
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