could jar
Regular verb: jar - jarred- jarred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I could not jar
you could not jar
he could not jar
we could not jar
you could not jar
they could not jar 	I could not be jarring
you could not be jarring
he could not be jarring
we could not be jarring
you could not be jarring
they could not be jarring	I could not have jarred
you could not have jarred
he could not have jarred
we could not have jarred
you could not have jarred
they could not have jarred	I could not have been jarring
you could not have been jarring
he could not have been jarring
we could not have been jarring
you could not have been jarring
they could not have been jarring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
could I not jar?
could you not jar?
could he not jar?
could we not jar?
could you not jar?
could they not jar? 	could I not be jarring?
could you not be jarring?
could he not be jarring?
could we not be jarring?
could you not be jarring?
could they not be jarring? 	could I not have jarred?
could you not have jarred?
could he not have jarred?
could we not have jarred?
could you not have jarred?
could they not have jarred? 	could I not have been jarring?
could you not have been jarring?
could he not have been jarring?
could we not have been jarring?
could you not have been jarring?
could they not have been jarring?