should alter
Regular verb: alter - altered- altered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should alter
you should alter
he should alter
we should alter
you should alter
they should alter 	I should be altering
you should be altering
he should be altering
we should be altering
you should be altering
they should be altering	I should have altered
you should have altered
he should have altered
we should have altered
you should have altered
they should have altered	I should have been altering
you should have been altering
he should have been altering
we should have been altering
you should have been altering
they should have been altering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not alter
you should not alter
he should not alter
we should not alter
you should not alter
they should not alter 	I should not be altering
you should not be altering
he should not be altering
we should not be altering
you should not be altering
they should not be altering	I should not have altered
you should not have altered
he should not have altered
we should not have altered
you should not have altered
they should not have altered	I should not have been altering
you should not have been altering
he should not have been altering
we should not have been altering
you should not have been altering
they should not have been altering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I alter?
should you alter?
should he alter?
should we alter?
should you alter?
should they alter? 	should I be altering?
should you be altering?
should he be altering?
should we be altering?
should you be altering?
should they be altering? 	should I have altered?
should you have altered?
should he have altered?
should we have altered?
should you have altered?
should they have altered? 	should I have been altering?
should you have been altering?
should he have been altering?
should we have been altering?
should you have been altering?
should they have been altering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not alter?
should you not alter?
should he not alter?
should we not alter?
should you not alter?
should they not alter? 	should I not be altering?
should you not be altering?
should he not be altering?
should we not be altering?
should you not be altering?
should they not be altering? 	should I not have altered?
should you not have altered?
should he not have altered?
should we not have altered?
should you not have altered?
should they not have altered? 	should I not have been altering?
should you not have been altering?
should he not have been altering?
should we not have been altering?
should you not have been altering?
should they not have been altering?