could tire
Regular verb: tire - tired- tired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tire
you could tire
she could tire
we could tire
you could tire
they could tire 	I could be tiring
you could be tiring
she could be tiring
we could be tiring
you could be tiring
they could be tiring	I could have tired
you could have tired
she 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
she 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 couldn't tire
you couldn't tire
she couldn't tire
we couldn't tire
you couldn't tire
they couldn't tire 	I couldn't be tiring
you couldn't be tiring
she couldn't be tiring
we couldn't be tiring
you couldn't be tiring
they couldn't be tiring	I couldn't have tired
you couldn't have tired
she couldn't have tired
we couldn't have tired
you couldn't have tired
they couldn't have tired	I couldn't have been tiring
you couldn't have been tiring
she couldn't have been tiring
we couldn't have been tiring
you couldn't have been tiring
they couldn't have been tiring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tire?
could you tire?
could she tire?
could we tire?
could you tire?
could they tire? 	could I be tiring?
could you be tiring?
could she be tiring?
could we be tiring?
could you be tiring?
could they be tiring? 	could I have tired?
could you have tired?
could she 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 she 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 	
couldn't I tire?
couldn't you tire?
couldn't she tire?
couldn't we tire?
couldn't you tire?
couldn't they tire? 	couldn't I be tiring?
couldn't you be tiring?
couldn't she be tiring?
couldn't we be tiring?
couldn't you be tiring?
couldn't they be tiring? 	couldn't I have tired?
couldn't you have tired?
couldn't she have tired?
couldn't we have tired?
couldn't you have tired?
couldn't they have tired? 	couldn't I have been tiring?
couldn't you have been tiring?
couldn't she have been tiring?
couldn't we have been tiring?
couldn't you have been tiring?
couldn't they have been tiring?