English verb conjugation
SHOULD SING

Irregular verb: sing - sang - sung

Affirmation

Simple form	V-ing form
I should sing you should sing she should sing we should sing you should sing they should sing	I should be singing you should be singing she should be singing we should be singing you should be singing they should be singing
Perfect	V-ing perfect
I should have sung you should have sung she should have sung we should have sung you should have sung they should have sung	I should have been singing you should have been singing she should have been singing we should have been singing you should have been singing they should have been singing

Negation

Simple form	V-ing form
I should not sing you should not sing she should not sing we should not sing you should not sing they should not sing	I should not be singing you should not be singing she should not be singing we should not be singing you should not be singing they should not be singing
Perfect	V-ing perfect
I should not have sung you should not have sung she should not have sung we should not have sung you should not have sung they should not have sung	I should not have been singing you should not have been singing she should not have been singing we should not have been singing you should not have been singing they should not have been singing

Interrogative form

Simple form	V-ing form
should I sing? should you sing? should she sing? should we sing? should you sing? should they sing?	should I be singing? should you be singing? should she 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 she 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 she 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
should I not sing? should you not sing? should she not sing? should we not sing? should you not sing? should they not sing?	should I not be singing? should you not be singing? should she not be singing? should we not be singing? should you not be singing? should they not be singing?
Perfect	V-ing perfect
should I not have sung? should you not have sung? should she not have sung? should we not have sung? should you not have sung? should they not have sung?	should I not have been singing? should you not have been singing? should she not have been singing? should we not have been singing? should you not have been singing? should they not have been singing?