English verb conjugation
SHOULD GAIN

Regular verb: gain - gained - gained

Affirmation

Simple form	V-ing form
I'd gain you'd gain he'd gain we'd gain you'd gain they'd gain	I'd be gaining you'd be gaining he'd be gaining we'd be gaining you'd be gaining they'd be gaining
Perfect	V-ing perfect
I should've gained you should've gained he should've gained we should've gained you should've gained they should've gained	I should've been gaining you should've been gaining he should've been gaining we should've been gaining you should've been gaining they should've been gaining

Negation

Simple form	V-ing form
I shouldn't gain you shouldn't gain he shouldn't gain we shouldn't gain you shouldn't gain they shouldn't gain	I shouldn't be gaining you shouldn't be gaining he shouldn't be gaining we shouldn't be gaining you shouldn't be gaining they shouldn't be gaining
Perfect	V-ing perfect
I shouldn't have gained you shouldn't have gained he shouldn't have gained we shouldn't have gained you shouldn't have gained they shouldn't have gained	I shouldn't have been gaining you shouldn't have been gaining he shouldn't have been gaining we shouldn't have been gaining you shouldn't have been gaining they shouldn't have been gaining

Interrogative form

Simple form	V-ing form
should I gain? should you gain? should he gain? should we gain? should you gain? should they gain?	should I be gaining? should you be gaining? should he be gaining? should we be gaining? should you be gaining? should they be gaining?
Perfect	V-ing perfect
should I have gained? should you have gained? should he have gained? should we have gained? should you have gained? should they have gained?	should I have been gaining? should you have been gaining? should he have been gaining? should we have been gaining? should you have been gaining? should they have been gaining?

Interro-negative form

Simple form	V-ing form
shouldn't I gain? shouldn't you gain? shouldn't he gain? shouldn't we gain? shouldn't you gain? shouldn't they gain?	shouldn't I be gaining? shouldn't you be gaining? shouldn't he be gaining? shouldn't we be gaining? shouldn't you be gaining? shouldn't they be gaining?
Perfect	V-ing perfect
shouldn't I have gained? shouldn't you have gained? shouldn't he have gained? shouldn't we have gained? shouldn't you have gained? shouldn't they have gained?	shouldn't I have been gaining? shouldn't you have been gaining? shouldn't he have been gaining? shouldn't we have been gaining? shouldn't you have been gaining? shouldn't they have been gaining?