could circulate
Verbo regular: circulate - circulated- circulated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could circulate
you could circulate
he could circulate
we could circulate
you could circulate
they could circulate 	I could be circulating
you could be circulating
he could be circulating
we could be circulating
you could be circulating
they could be circulating	I could have circulated
you could have circulated
he could have circulated
we could have circulated
you could have circulated
they could have circulated	I could have been circulating
you could have been circulating
he could have been circulating
we could have been circulating
you could have been circulating
they could have been circulating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not circulate
you could not circulate
he could not circulate
we could not circulate
you could not circulate
they could not circulate 	I could not be circulating
you could not be circulating
he could not be circulating
we could not be circulating
you could not be circulating
they could not be circulating	I could not have circulated
you could not have circulated
he could not have circulated
we could not have circulated
you could not have circulated
they could not have circulated	I could not have been circulating
you could not have been circulating
he could not have been circulating
we could not have been circulating
you could not have been circulating
they could not have been circulating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I circulate?
could you circulate?
could he circulate?
could we circulate?
could you circulate?
could they circulate? 	could I be circulating?
could you be circulating?
could he be circulating?
could we be circulating?
could you be circulating?
could they be circulating? 	could I have circulated?
could you have circulated?
could he have circulated?
could we have circulated?
could you have circulated?
could they have circulated? 	could I have been circulating?
could you have been circulating?
could he have been circulating?
could we have been circulating?
could you have been circulating?
could they have been circulating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not circulate?
could you not circulate?
could he not circulate?
could we not circulate?
could you not circulate?
could they not circulate? 	could I not be circulating?
could you not be circulating?
could he not be circulating?
could we not be circulating?
could you not be circulating?
could they not be circulating? 	could I not have circulated?
could you not have circulated?
could he not have circulated?
could we not have circulated?
could you not have circulated?
could they not have circulated? 	could I not have been circulating?
could you not have been circulating?
could he not have been circulating?
could we not have been circulating?
could you not have been circulating?
could they not have been circulating?