could jab
Regular verb: jab - jabbed- jabbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could jab
you could jab
he could jab
we could jab
you could jab
they could jab 	I could be jabbing
you could be jabbing
he could be jabbing
we could be jabbing
you could be jabbing
they could be jabbing	I could have jabbed
you could have jabbed
he could have jabbed
we could have jabbed
you could have jabbed
they could have jabbed	I could have been jabbing
you could have been jabbing
he could have been jabbing
we could have been jabbing
you could have been jabbing
they could have been jabbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not jab
you could not jab
he could not jab
we could not jab
you could not jab
they could not jab 	I could not be jabbing
you could not be jabbing
he could not be jabbing
we could not be jabbing
you could not be jabbing
they could not be jabbing	I could not have jabbed
you could not have jabbed
he could not have jabbed
we could not have jabbed
you could not have jabbed
they could not have jabbed	I could not have been jabbing
you could not have been jabbing
he could not have been jabbing
we could not have been jabbing
you could not have been jabbing
they could not have been jabbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I jab?
could you jab?
could he jab?
could we jab?
could you jab?
could they jab? 	could I be jabbing?
could you be jabbing?
could he be jabbing?
could we be jabbing?
could you be jabbing?
could they be jabbing? 	could I have jabbed?
could you have jabbed?
could he have jabbed?
could we have jabbed?
could you have jabbed?
could they have jabbed? 	could I have been jabbing?
could you have been jabbing?
could he have been jabbing?
could we have been jabbing?
could you have been jabbing?
could they have been jabbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not jab?
could you not jab?
could he not jab?
could we not jab?
could you not jab?
could they not jab? 	could I not be jabbing?
could you not be jabbing?
could he not be jabbing?
could we not be jabbing?
could you not be jabbing?
could they not be jabbing? 	could I not have jabbed?
could you not have jabbed?
could he not have jabbed?
could we not have jabbed?
could you not have jabbed?
could they not have jabbed? 	could I not have been jabbing?
could you not have been jabbing?
could he not have been jabbing?
could we not have been jabbing?
could you not have been jabbing?
could they not have been jabbing?