English verb conjugation
COULD TIRE

Regular verb: tire - tired - tired

Affirmation

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