I'd alter you'd alter she'd alter we'd alter you'd alter they'd alter
V-ing form
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
I should've altered you should've altered she should've altered we should've altered you should've altered they should've altered
V-ing perfect
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
I shouldn't alter you shouldn't alter she shouldn't alter we shouldn't alter you shouldn't alter they shouldn't alter
V-ing form
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
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
V-ing perfect
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
should I alter? should you alter? should she alter? should we alter? should you alter? should they alter?
V-ing form
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
should I have altered? should you have altered? should she have altered? should we have altered? should you have altered? should they have altered?
V-ing perfect
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
shouldn't I alter? shouldn't you alter? shouldn't she alter? shouldn't we alter? shouldn't you alter? shouldn't they alter?
V-ing form
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
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?
V-ing perfect
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?