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