English verb conjugation
COULD RACE

Regular verb: race - raced - raced

Affirmation

Simple form	V-ing form
I could race you could race he could race we could race you could race they could race	I could be racing you could be racing he could be racing we could be racing you could be racing they could be racing
Perfect	V-ing perfect
I could have raced you could have raced he could have raced we could have raced you could have raced they could have raced	I could have been racing you could have been racing he could have been racing we could have been racing you could have been racing they could have been racing

Negation

Simple form	V-ing form
I couldn't race you couldn't race he couldn't race we couldn't race you couldn't race they couldn't race	I couldn't be racing you couldn't be racing he couldn't be racing we couldn't be racing you couldn't be racing they couldn't be racing
Perfect	V-ing perfect
I couldn't have raced you couldn't have raced he couldn't have raced we couldn't have raced you couldn't have raced they couldn't have raced	I couldn't have been racing you couldn't have been racing he couldn't have been racing we couldn't have been racing you couldn't have been racing they couldn't have been racing

Interrogative form

Simple form	V-ing form
could I race? could you race? could he race? could we race? could you race? could they race?	could I be racing? could you be racing? could he be racing? could we be racing? could you be racing? could they be racing?
Perfect	V-ing perfect
could I have raced? could you have raced? could he have raced? could we have raced? could you have raced? could they have raced?	could I have been racing? could you have been racing? could he have been racing? could we have been racing? could you have been racing? could they have been racing?

Interro-negative form

Simple form	V-ing form
couldn't I race? couldn't you race? couldn't he race? couldn't we race? couldn't you race? couldn't they race?	couldn't I be racing? couldn't you be racing? couldn't he be racing? couldn't we be racing? couldn't you be racing? couldn't they be racing?
Perfect	V-ing perfect
couldn't I have raced? couldn't you have raced? couldn't he have raced? couldn't we have raced? couldn't you have raced? couldn't they have raced?	couldn't I have been racing? couldn't you have been racing? couldn't he have been racing? couldn't we have been racing? couldn't you have been racing? couldn't they have been racing?