English verb conjugation
SHOULD STACK

Regular verb: stack - stacked - stacked

Affirmation

Simple form	V-ing form
I'd stack you'd stack he'd stack we'd stack you'd stack they'd stack	I'd be stacking you'd be stacking he'd be stacking we'd be stacking you'd be stacking they'd be stacking
Perfect	V-ing perfect
I should've stacked you should've stacked he should've stacked we should've stacked you should've stacked they should've stacked	I should've been stacking you should've been stacking he should've been stacking we should've been stacking you should've been stacking they should've been stacking

Negation

Simple form	V-ing form
I shouldn't stack you shouldn't stack he shouldn't stack we shouldn't stack you shouldn't stack they shouldn't stack	I shouldn't be stacking you shouldn't be stacking he shouldn't be stacking we shouldn't be stacking you shouldn't be stacking they shouldn't be stacking
Perfect	V-ing perfect
I shouldn't have stacked you shouldn't have stacked he shouldn't have stacked we shouldn't have stacked you shouldn't have stacked they shouldn't have stacked	I shouldn't have been stacking you shouldn't have been stacking he shouldn't have been stacking we shouldn't have been stacking you shouldn't have been stacking they shouldn't have been stacking

Interrogative form

Simple form	V-ing form
should I stack? should you stack? should he stack? should we stack? should you stack? should they stack?	should I be stacking? should you be stacking? should he be stacking? should we be stacking? should you be stacking? should they be stacking?
Perfect	V-ing perfect
should I have stacked? should you have stacked? should he have stacked? should we have stacked? should you have stacked? should they have stacked?	should I have been stacking? should you have been stacking? should he have been stacking? should we have been stacking? should you have been stacking? should they have been stacking?

Interro-negative form

Simple form	V-ing form
shouldn't I stack? shouldn't you stack? shouldn't he stack? shouldn't we stack? shouldn't you stack? shouldn't they stack?	shouldn't I be stacking? shouldn't you be stacking? shouldn't he be stacking? shouldn't we be stacking? shouldn't you be stacking? shouldn't they be stacking?
Perfect	V-ing perfect
shouldn't I have stacked? shouldn't you have stacked? shouldn't he have stacked? shouldn't we have stacked? shouldn't you have stacked? shouldn't they have stacked?	shouldn't I have been stacking? shouldn't you have been stacking? shouldn't he have been stacking? shouldn't we have been stacking? shouldn't you have been stacking? shouldn't they have been stacking?