could tire
Verbo regular: tire - tired- tired

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't tire
you couldn't tire
he 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
he 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
he 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
he couldn't have been tiring
we couldn't have been tiring
you couldn't have been tiring
they couldn't have been tiring	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I tire?
couldn't you tire?
couldn't he 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 he 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 he 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 he have been tiring?
couldn't we have been tiring?
couldn't you have been tiring?
couldn't they have been tiring?