should sing
Irregular verb: sing - sang- sung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?