English verb conjugation
COULD SPAR

Regular verb: spar - sparred - sparred

Affirmation

Simple form	V-ing form
I could spar you could spar he could spar we could spar you could spar they could spar	I could be sparring you could be sparring he could be sparring we could be sparring you could be sparring they could be sparring
Perfect	V-ing perfect
I could have sparred you could have sparred he could have sparred we could have sparred you could have sparred they could have sparred	I could have been sparring you could have been sparring he could have been sparring we could have been sparring you could have been sparring they could have been sparring

Negation

Simple form	V-ing form
I couldn't spar you couldn't spar he couldn't spar we couldn't spar you couldn't spar they couldn't spar	I couldn't be sparring you couldn't be sparring he couldn't be sparring we couldn't be sparring you couldn't be sparring they couldn't be sparring
Perfect	V-ing perfect
I couldn't have sparred you couldn't have sparred he couldn't have sparred we couldn't have sparred you couldn't have sparred they couldn't have sparred	I couldn't have been sparring you couldn't have been sparring he couldn't have been sparring we couldn't have been sparring you couldn't have been sparring they couldn't have been sparring

Interrogative form

Simple form	V-ing form
could I spar? could you spar? could he spar? could we spar? could you spar? could they spar?	could I be sparring? could you be sparring? could he be sparring? could we be sparring? could you be sparring? could they be sparring?
Perfect	V-ing perfect
could I have sparred? could you have sparred? could he have sparred? could we have sparred? could you have sparred? could they have sparred?	could I have been sparring? could you have been sparring? could he have been sparring? could we have been sparring? could you have been sparring? could they have been sparring?

Interro-negative form

Simple form	V-ing form
couldn't I spar? couldn't you spar? couldn't he spar? couldn't we spar? couldn't you spar? couldn't they spar?	couldn't I be sparring? couldn't you be sparring? couldn't he be sparring? couldn't we be sparring? couldn't you be sparring? couldn't they be sparring?
Perfect	V-ing perfect
couldn't I have sparred? couldn't you have sparred? couldn't he have sparred? couldn't we have sparred? couldn't you have sparred? couldn't they have sparred?	couldn't I have been sparring? couldn't you have been sparring? couldn't he have been sparring? couldn't we have been sparring? couldn't you have been sparring? couldn't they have been sparring?