I'd sing you'd sing he'd sing we'd sing you'd sing they'd sing
V-ing form
I'd be singing you'd be singing he'd be singing we'd be singing you'd be singing they'd be singing
Perfect
I should've sung you should've sung he should've sung we should've sung you should've sung they should've sung
V-ing perfect
I should've been singing you should've been singing he should've been singing we should've been singing you should've been singing they should've been singing
Negation
Simple form
I shouldn't sing you shouldn't sing he shouldn't sing we shouldn't sing you shouldn't sing they shouldn't sing
V-ing form
I shouldn't be singing you shouldn't be singing he shouldn't be singing we shouldn't be singing you shouldn't be singing they shouldn't be singing
Perfect
I shouldn't have sung you shouldn't have sung he shouldn't have sung we shouldn't have sung you shouldn't have sung they shouldn't have sung
V-ing perfect
I shouldn't have been singing you shouldn't have been singing he shouldn't have been singing we shouldn't have been singing you shouldn't have been singing they shouldn't have been singing
Interrogative form
Simple form
should I sing? should you sing? should he sing? should we sing? should you sing? should they sing?
V-ing form
should I be singing? should you be singing? should he be singing? should we be singing? should you be singing? should they be singing?
Perfect
should I have sung? should you have sung? should he have sung? should we have sung? should you have sung? should they have sung?
V-ing perfect
should I have been singing? should you have been singing? should he have been singing? should we have been singing? should you have been singing? should they have been singing?
Interro-negative form
Simple form
shouldn't I sing? shouldn't you sing? shouldn't he sing? shouldn't we sing? shouldn't you sing? shouldn't they sing?
V-ing form
shouldn't I be singing? shouldn't you be singing? shouldn't he be singing? shouldn't we be singing? shouldn't you be singing? shouldn't they be singing?
Perfect
shouldn't I have sung? shouldn't you have sung? shouldn't he have sung? shouldn't we have sung? shouldn't you have sung? shouldn't they have sung?
V-ing perfect
shouldn't I have been singing? shouldn't you have been singing? shouldn't he have been singing? shouldn't we have been singing? shouldn't you have been singing? shouldn't they have been singing?