I'd alter you'd alter he'd alter we'd alter you'd alter they'd alter
V-ing form
I'd be altering you'd be altering he'd be altering we'd be altering you'd be altering they'd be altering
Perfect
I should've altered you should've altered he 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 he 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 he 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 he 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 he 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 he 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 he alter? should we alter? should you alter? should they alter?
V-ing form
should I be altering? should you be altering? should he be altering? should we be altering? should you be altering? should they be altering?
Perfect
should I have altered? should you have altered? should he 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 he 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 he 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 he 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 he 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 he have been altering? shouldn't we have been altering? shouldn't you have been altering? shouldn't they have been altering?