could calculate
Verbo regular: calculate - calculated- calculated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could calculate
you could calculate
he could calculate
we could calculate
you could calculate
they could calculate 	I could be calculating
you could be calculating
he could be calculating
we could be calculating
you could be calculating
they could be calculating	I could have calculated
you could have calculated
he 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
he could have been calculating
we could have been calculating
you could have been calculating
they could have been calculating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not calculate
you could not calculate
he 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
he 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
he 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
he 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 com V-ing 	Perfeito 	Perfeito com V-ing 	
could I calculate?
could you calculate?
could he calculate?
could we calculate?
could you calculate?
could they calculate? 	could I be calculating?
could you be calculating?
could he be calculating?
could we be calculating?
could you be calculating?
could they be calculating? 	could I have calculated?
could you have calculated?
could he 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 he have been calculating?
could we have been calculating?
could you have been calculating?
could they have been calculating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not calculate?
could you not calculate?
could he 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 he 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 he 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 he not have been calculating?
could we not have been calculating?
could you not have been calculating?
could they not have been calculating?