I'd be backstroking you'd be backstroking he'd be backstroking we'd be backstroking you'd be backstroking they'd be backstroking
Perfect
I should've backstroked you should've backstroked he 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 he 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 he 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 he 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 he 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 he 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 he backstroke? should we backstroke? should you backstroke? should they backstroke?
V-ing form
should I be backstroking? should you be backstroking? should he be backstroking? should we be backstroking? should you be backstroking? should they be backstroking?
Perfect
should I have backstroked? should you have backstroked? should he 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 he 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 he 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 he 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 he 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 he have been backstroking? shouldn't we have been backstroking? shouldn't you have been backstroking? shouldn't they have been backstroking?