English verb conjugation
SHOULD BUY

Irregular verb: buy - bought - bought

Affirmation

Simple form	V-ing form
I'd buy you'd buy he'd buy we'd buy you'd buy they'd buy	I'd be buying you'd be buying he'd be buying we'd be buying you'd be buying they'd be buying
Perfect	V-ing perfect
I should've bought you should've bought he should've bought we should've bought you should've bought they should've bought	I should've been buying you should've been buying he should've been buying we should've been buying you should've been buying they should've been buying

Negation

Simple form	V-ing form
I shouldn't buy you shouldn't buy he shouldn't buy we shouldn't buy you shouldn't buy they shouldn't buy	I shouldn't be buying you shouldn't be buying he shouldn't be buying we shouldn't be buying you shouldn't be buying they shouldn't be buying
Perfect	V-ing perfect
I shouldn't have bought you shouldn't have bought he shouldn't have bought we shouldn't have bought you shouldn't have bought they shouldn't have bought	I shouldn't have been buying you shouldn't have been buying he shouldn't have been buying we shouldn't have been buying you shouldn't have been buying they shouldn't have been buying

Interrogative form

Simple form	V-ing form
should I buy? should you buy? should he buy? should we buy? should you buy? should they buy?	should I be buying? should you be buying? should he be buying? should we be buying? should you be buying? should they be buying?
Perfect	V-ing perfect
should I have bought? should you have bought? should he have bought? should we have bought? should you have bought? should they have bought?	should I have been buying? should you have been buying? should he have been buying? should we have been buying? should you have been buying? should they have been buying?

Interro-negative form

Simple form	V-ing form
shouldn't I buy? shouldn't you buy? shouldn't he buy? shouldn't we buy? shouldn't you buy? shouldn't they buy?	shouldn't I be buying? shouldn't you be buying? shouldn't he be buying? shouldn't we be buying? shouldn't you be buying? shouldn't they be buying?
Perfect	V-ing perfect
shouldn't I have bought? shouldn't you have bought? shouldn't he have bought? shouldn't we have bought? shouldn't you have bought? shouldn't they have bought?	shouldn't I have been buying? shouldn't you have been buying? shouldn't he have been buying? shouldn't we have been buying? shouldn't you have been buying? shouldn't they have been buying?