I'd be screwing you'd be screwing she'd be screwing we'd be screwing you'd be screwing they'd be screwing
Perfect
I should've screwed you should've screwed she should've screwed we should've screwed you should've screwed they should've screwed
V-ing perfect
I should've been screwing you should've been screwing she should've been screwing we should've been screwing you should've been screwing they should've been screwing
Negation
Simple form
I shouldn't screw you shouldn't screw she shouldn't screw we shouldn't screw you shouldn't screw they shouldn't screw
V-ing form
I shouldn't be screwing you shouldn't be screwing she shouldn't be screwing we shouldn't be screwing you shouldn't be screwing they shouldn't be screwing
Perfect
I shouldn't have screwed you shouldn't have screwed she shouldn't have screwed we shouldn't have screwed you shouldn't have screwed they shouldn't have screwed
V-ing perfect
I shouldn't have been screwing you shouldn't have been screwing she shouldn't have been screwing we shouldn't have been screwing you shouldn't have been screwing they shouldn't have been screwing
Interrogative form
Simple form
should I screw? should you screw? should she screw? should we screw? should you screw? should they screw?
V-ing form
should I be screwing? should you be screwing? should she be screwing? should we be screwing? should you be screwing? should they be screwing?
Perfect
should I have screwed? should you have screwed? should she have screwed? should we have screwed? should you have screwed? should they have screwed?
V-ing perfect
should I have been screwing? should you have been screwing? should she have been screwing? should we have been screwing? should you have been screwing? should they have been screwing?
Interro-negative form
Simple form
shouldn't I screw? shouldn't you screw? shouldn't she screw? shouldn't we screw? shouldn't you screw? shouldn't they screw?
V-ing form
shouldn't I be screwing? shouldn't you be screwing? shouldn't she be screwing? shouldn't we be screwing? shouldn't you be screwing? shouldn't they be screwing?
Perfect
shouldn't I have screwed? shouldn't you have screwed? shouldn't she have screwed? shouldn't we have screwed? shouldn't you have screwed? shouldn't they have screwed?
V-ing perfect
shouldn't I have been screwing? shouldn't you have been screwing? shouldn't she have been screwing? shouldn't we have been screwing? shouldn't you have been screwing? shouldn't they have been screwing?