could blackjack
Regular verb: blackjack - blackjacked- blackjacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could blackjack
you could blackjack
he could blackjack
we could blackjack
you could blackjack
they could blackjack 	I could be blackjacking
you could be blackjacking
he could be blackjacking
we could be blackjacking
you could be blackjacking
they could be blackjacking	I could have blackjacked
you could have blackjacked
he could have blackjacked
we could have blackjacked
you could have blackjacked
they could have blackjacked	I could have been blackjacking
you could have been blackjacking
he could have been blackjacking
we could have been blackjacking
you could have been blackjacking
they could have been blackjacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't blackjack
you couldn't blackjack
he couldn't blackjack
we couldn't blackjack
you couldn't blackjack
they couldn't blackjack 	I couldn't be blackjacking
you couldn't be blackjacking
he couldn't be blackjacking
we couldn't be blackjacking
you couldn't be blackjacking
they couldn't be blackjacking	I couldn't have blackjacked
you couldn't have blackjacked
he couldn't have blackjacked
we couldn't have blackjacked
you couldn't have blackjacked
they couldn't have blackjacked	I couldn't have been blackjacking
you couldn't have been blackjacking
he couldn't have been blackjacking
we couldn't have been blackjacking
you couldn't have been blackjacking
they couldn't have been blackjacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I blackjack?
could you blackjack?
could he blackjack?
could we blackjack?
could you blackjack?
could they blackjack? 	could I be blackjacking?
could you be blackjacking?
could he be blackjacking?
could we be blackjacking?
could you be blackjacking?
could they be blackjacking? 	could I have blackjacked?
could you have blackjacked?
could he have blackjacked?
could we have blackjacked?
could you have blackjacked?
could they have blackjacked? 	could I have been blackjacking?
could you have been blackjacking?
could he have been blackjacking?
could we have been blackjacking?
could you have been blackjacking?
could they have been blackjacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I blackjack?
couldn't you blackjack?
couldn't he blackjack?
couldn't we blackjack?
couldn't you blackjack?
couldn't they blackjack? 	couldn't I be blackjacking?
couldn't you be blackjacking?
couldn't he be blackjacking?
couldn't we be blackjacking?
couldn't you be blackjacking?
couldn't they be blackjacking? 	couldn't I have blackjacked?
couldn't you have blackjacked?
couldn't he have blackjacked?
couldn't we have blackjacked?
couldn't you have blackjacked?
couldn't they have blackjacked? 	couldn't I have been blackjacking?
couldn't you have been blackjacking?
couldn't he have been blackjacking?
couldn't we have been blackjacking?
couldn't you have been blackjacking?
couldn't they have been blackjacking?