could tire
Regular verb: tire - tired- tired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tire
you could tire
he could tire
we could tire
you could tire
they could tire 	I could be tiring
you could be tiring
he could be tiring
we could be tiring
you could be tiring
they could be tiring	I could have tired
you could have tired
he could have tired
we could have tired
you could have tired
they could have tired	I could have been tiring
you could have been tiring
he could have been tiring
we could have been tiring
you could have been tiring
they could have been tiring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not tire
you could not tire
he could not tire
we could not tire
you could not tire
they could not tire 	I could not be tiring
you could not be tiring
he could not be tiring
we could not be tiring
you could not be tiring
they could not be tiring	I could not have tired
you could not have tired
he could not have tired
we could not have tired
you could not have tired
they could not have tired	I could not have been tiring
you could not have been tiring
he could not have been tiring
we could not have been tiring
you could not have been tiring
they could not have been tiring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tire?
could you tire?
could he tire?
could we tire?
could you tire?
could they tire? 	could I be tiring?
could you be tiring?
could he be tiring?
could we be tiring?
could you be tiring?
could they be tiring? 	could I have tired?
could you have tired?
could he have tired?
could we have tired?
could you have tired?
could they have tired? 	could I have been tiring?
could you have been tiring?
could he have been tiring?
could we have been tiring?
could you have been tiring?
could they have been tiring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not tire?
could you not tire?
could he not tire?
could we not tire?
could you not tire?
could they not tire? 	could I not be tiring?
could you not be tiring?
could he not be tiring?
could we not be tiring?
could you not be tiring?
could they not be tiring? 	could I not have tired?
could you not have tired?
could he not have tired?
could we not have tired?
could you not have tired?
could they not have tired? 	could I not have been tiring?
could you not have been tiring?
could he not have been tiring?
could we not have been tiring?
could you not have been tiring?
could they not have been tiring?