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
I should've bought you should've bought he should've bought we should've bought you should've bought they should've bought
V-ing perfect
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
I shouldn't buy you shouldn't buy he shouldn't buy we shouldn't buy you shouldn't buy they shouldn't buy
V-ing form
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
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
V-ing perfect
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
should I buy? should you buy? should he buy? should we buy? should you buy? should they buy?
V-ing form
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
should I have bought? should you have bought? should he have bought? should we have bought? should you have bought? should they have bought?
V-ing perfect
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
shouldn't I buy? shouldn't you buy? shouldn't he buy? shouldn't we buy? shouldn't you buy? shouldn't they buy?
V-ing form
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
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?
V-ing perfect
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?