English verb conjugation
COULD JAR

Regular verb: jar - jarred - jarred

Affirmation

Simple form	V-ing form
I could jar you could jar he could jar we could jar you could jar they could jar	I could be jarring you could be jarring he could be jarring we could be jarring you could be jarring they could be jarring
Perfect	V-ing perfect
I could have jarred you could have jarred he could have jarred we could have jarred you could have jarred they could have jarred	I could have been jarring you could have been jarring he could have been jarring we could have been jarring you could have been jarring they could have been jarring

Negation

Simple form	V-ing form
I couldn't jar you couldn't jar he couldn't jar we couldn't jar you couldn't jar they couldn't jar	I couldn't be jarring you couldn't be jarring he couldn't be jarring we couldn't be jarring you couldn't be jarring they couldn't be jarring
Perfect	V-ing perfect
I couldn't have jarred you couldn't have jarred he couldn't have jarred we couldn't have jarred you couldn't have jarred they couldn't have jarred	I couldn't have been jarring you couldn't have been jarring he couldn't have been jarring we couldn't have been jarring you couldn't have been jarring they couldn't have been jarring

Interrogative form

Simple form	V-ing form
could I jar? could you jar? could he jar? could we jar? could you jar? could they jar?	could I be jarring? could you be jarring? could he be jarring? could we be jarring? could you be jarring? could they be jarring?
Perfect	V-ing perfect
could I have jarred? could you have jarred? could he have jarred? could we have jarred? could you have jarred? could they have jarred?	could I have been jarring? could you have been jarring? could he have been jarring? could we have been jarring? could you have been jarring? could they have been jarring?

Interro-negative form

Simple form	V-ing form
couldn't I jar? couldn't you jar? couldn't he jar? couldn't we jar? couldn't you jar? couldn't they jar?	couldn't I be jarring? couldn't you be jarring? couldn't he be jarring? couldn't we be jarring? couldn't you be jarring? couldn't they be jarring?
Perfect	V-ing perfect
couldn't I have jarred? couldn't you have jarred? couldn't he have jarred? couldn't we have jarred? couldn't you have jarred? couldn't they have jarred?	couldn't I have been jarring? couldn't you have been jarring? couldn't he have been jarring? couldn't we have been jarring? couldn't you have been jarring? couldn't they have been jarring?