can sing
Verbo irregular: sing - sang- sung

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can sing
you can sing
she can sing
we can sing
you can sing
they can sing 	I can be singing
you can be singing
she can be singing
we can be singing
you can be singing
they can be singing	I can have sung
you can have sung
she can have sung
we can have sung
you can have sung
they can have sung	I can have been singing
you can have been singing
she can have been singing
we can have been singing
you can have been singing
they can have been singing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot sing
you cannot sing
she cannot sing
we cannot sing
you cannot sing
they cannot sing 	I cannot be singing
you cannot be singing
she cannot be singing
we cannot be singing
you cannot be singing
they cannot be singing	I cannot have sung
you cannot have sung
she cannot have sung
we cannot have sung
you cannot have sung
they cannot have sung	I cannot have been singing
you cannot have been singing
she cannot have been singing
we cannot have been singing
you cannot have been singing
they cannot have been singing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I sing?
can you sing?
can she sing?
can we sing?
can you sing?
can they sing? 	can I be singing?
can you be singing?
can she be singing?
can we be singing?
can you be singing?
can they be singing? 	can I have sung?
can you have sung?
can she have sung?
can we have sung?
can you have sung?
can they have sung? 	can I have been singing?
can you have been singing?
can she have been singing?
can we have been singing?
can you have been singing?
can they have been singing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not sing?
can you not sing?
can she not sing?
can we not sing?
can you not sing?
can they not sing? 	can I not be singing?
can you not be singing?
can she not be singing?
can we not be singing?
can you not be singing?
can they not be singing? 	can I not have sung?
can you not have sung?
can she not have sung?
can we not have sung?
can you not have sung?
can they not have sung? 	can I not have been singing?
can you not have been singing?
can she not have been singing?
can we not have been singing?
can you not have been singing?
can they not have been singing?