English verb conjugation
SHOULD SING

Irregular verb: sing - sang - sung

Affirmation

Simple form	V-ing form
I'd sing you'd sing he'd sing we'd sing you'd sing they'd sing	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
should I sing? should you sing? should he sing? should we sing? should you sing? should they sing?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?