could blackjack
Regular verb: blackjack - blackjacked- blackjacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could blackjack
you could blackjack
she could blackjack
we could blackjack
you could blackjack
they could blackjack 	I could be blackjacking
you could be blackjacking
she could be blackjacking
we could be blackjacking
you could be blackjacking
they could be blackjacking	I could have blackjacked
you could have blackjacked
she 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
she 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
she 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
she 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
she 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
she 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 she blackjack?
could we blackjack?
could you blackjack?
could they blackjack? 	could I be blackjacking?
could you be blackjacking?
could she be blackjacking?
could we be blackjacking?
could you be blackjacking?
could they be blackjacking? 	could I have blackjacked?
could you have blackjacked?
could she 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 she 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 she 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 she 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 she 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 she have been blackjacking?
couldn't we have been blackjacking?
couldn't you have been blackjacking?
couldn't they have been blackjacking?