could cool
Regular verb: cool - cooled- cooled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cool
you could cool
he could cool
we could cool
you could cool
they could cool 	I could be cooling
you could be cooling
he could be cooling
we could be cooling
you could be cooling
they could be cooling	I could have cooled
you could have cooled
he could have cooled
we could have cooled
you could have cooled
they could have cooled	I could have been cooling
you could have been cooling
he could have been cooling
we could have been cooling
you could have been cooling
they could have been cooling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't cool
you couldn't cool
he couldn't cool
we couldn't cool
you couldn't cool
they couldn't cool 	I couldn't be cooling
you couldn't be cooling
he couldn't be cooling
we couldn't be cooling
you couldn't be cooling
they couldn't be cooling	I couldn't have cooled
you couldn't have cooled
he couldn't have cooled
we couldn't have cooled
you couldn't have cooled
they couldn't have cooled	I couldn't have been cooling
you couldn't have been cooling
he couldn't have been cooling
we couldn't have been cooling
you couldn't have been cooling
they couldn't have been cooling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cool?
could you cool?
could he cool?
could we cool?
could you cool?
could they cool? 	could I be cooling?
could you be cooling?
could he be cooling?
could we be cooling?
could you be cooling?
could they be cooling? 	could I have cooled?
could you have cooled?
could he have cooled?
could we have cooled?
could you have cooled?
could they have cooled? 	could I have been cooling?
could you have been cooling?
could he have been cooling?
could we have been cooling?
could you have been cooling?
could they have been cooling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I cool?
couldn't you cool?
couldn't he cool?
couldn't we cool?
couldn't you cool?
couldn't they cool? 	couldn't I be cooling?
couldn't you be cooling?
couldn't he be cooling?
couldn't we be cooling?
couldn't you be cooling?
couldn't they be cooling? 	couldn't I have cooled?
couldn't you have cooled?
couldn't he have cooled?
couldn't we have cooled?
couldn't you have cooled?
couldn't they have cooled? 	couldn't I have been cooling?
couldn't you have been cooling?
couldn't he have been cooling?
couldn't we have been cooling?
couldn't you have been cooling?
couldn't they have been cooling?