English verb conjugation
SHOULD ALTER

Regular verb: alter - altered - altered

Affirmation

Simple form	V-ing form
I'd alter you'd alter she'd alter we'd alter you'd alter they'd alter	I'd be altering you'd be altering she'd be altering we'd be altering you'd be altering they'd be altering
Perfect	V-ing perfect
I should've altered you should've altered she should've altered we should've altered you should've altered they should've altered	I should've been altering you should've been altering she should've been altering we should've been altering you should've been altering they should've been altering

Negation

Simple form	V-ing form
I shouldn't alter you shouldn't alter she shouldn't alter we shouldn't alter you shouldn't alter they shouldn't alter	I shouldn't be altering you shouldn't be altering she shouldn't be altering we shouldn't be altering you shouldn't be altering they shouldn't be altering
Perfect	V-ing perfect
I shouldn't have altered you shouldn't have altered she shouldn't have altered we shouldn't have altered you shouldn't have altered they shouldn't have altered	I shouldn't have been altering you shouldn't have been altering she shouldn't have been altering we shouldn't have been altering you shouldn't have been altering they shouldn't have been altering

Interrogative form

Simple form	V-ing form
should I alter? should you alter? should she alter? should we alter? should you alter? should they alter?	should I be altering? should you be altering? should she be altering? should we be altering? should you be altering? should they be altering?
Perfect	V-ing perfect
should I have altered? should you have altered? should she 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 she 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
shouldn't I alter? shouldn't you alter? shouldn't she alter? shouldn't we alter? shouldn't you alter? shouldn't they alter?	shouldn't I be altering? shouldn't you be altering? shouldn't she be altering? shouldn't we be altering? shouldn't you be altering? shouldn't they be altering?
Perfect	V-ing perfect
shouldn't I have altered? shouldn't you have altered? shouldn't she have altered? shouldn't we have altered? shouldn't you have altered? shouldn't they have altered?	shouldn't I have been altering? shouldn't you have been altering? shouldn't she have been altering? shouldn't we have been altering? shouldn't you have been altering? shouldn't they have been altering?