could calculate
Verbo regular: calculate - calculated- calculated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could calculate
you could calculate
she could calculate
we could calculate
you could calculate
they could calculate 	I could be calculating
you could be calculating
she could be calculating
we could be calculating
you could be calculating
they could be calculating	I could have calculated
you could have calculated
she could have calculated
we could have calculated
you could have calculated
they could have calculated	I could have been calculating
you could have been calculating
she could have been calculating
we could have been calculating
you could have been calculating
they could have been calculating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not calculate
you could not calculate
she could not calculate
we could not calculate
you could not calculate
they could not calculate 	I could not be calculating
you could not be calculating
she could not be calculating
we could not be calculating
you could not be calculating
they could not be calculating	I could not have calculated
you could not have calculated
she could not have calculated
we could not have calculated
you could not have calculated
they could not have calculated	I could not have been calculating
you could not have been calculating
she could not have been calculating
we could not have been calculating
you could not have been calculating
they could not have been calculating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I calculate?
could you calculate?
could she calculate?
could we calculate?
could you calculate?
could they calculate? 	could I be calculating?
could you be calculating?
could she be calculating?
could we be calculating?
could you be calculating?
could they be calculating? 	could I have calculated?
could you have calculated?
could she have calculated?
could we have calculated?
could you have calculated?
could they have calculated? 	could I have been calculating?
could you have been calculating?
could she have been calculating?
could we have been calculating?
could you have been calculating?
could they have been calculating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not calculate?
could you not calculate?
could she not calculate?
could we not calculate?
could you not calculate?
could they not calculate? 	could I not be calculating?
could you not be calculating?
could she not be calculating?
could we not be calculating?
could you not be calculating?
could they not be calculating? 	could I not have calculated?
could you not have calculated?
could she not have calculated?
could we not have calculated?
could you not have calculated?
could they not have calculated? 	could I not have been calculating?
could you not have been calculating?
could she not have been calculating?
could we not have been calculating?
could you not have been calculating?
could they not have been calculating?