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 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
Perfect	V-ing perfect
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
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
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?
Perfect	V-ing perfect
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?