could blackguard
Regular verb: blackguard - blackguarded- blackguarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could blackguard
you could blackguard
he could blackguard
we could blackguard
you could blackguard
they could blackguard 	I could be blackguarding
you could be blackguarding
he could be blackguarding
we could be blackguarding
you could be blackguarding
they could be blackguarding	I could have blackguarded
you could have blackguarded
he could have blackguarded
we could have blackguarded
you could have blackguarded
they could have blackguarded	I could have been blackguarding
you could have been blackguarding
he could have been blackguarding
we could have been blackguarding
you could have been blackguarding
they could have been blackguarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't blackguard
you couldn't blackguard
he couldn't blackguard
we couldn't blackguard
you couldn't blackguard
they couldn't blackguard 	I couldn't be blackguarding
you couldn't be blackguarding
he couldn't be blackguarding
we couldn't be blackguarding
you couldn't be blackguarding
they couldn't be blackguarding	I couldn't have blackguarded
you couldn't have blackguarded
he couldn't have blackguarded
we couldn't have blackguarded
you couldn't have blackguarded
they couldn't have blackguarded	I couldn't have been blackguarding
you couldn't have been blackguarding
he couldn't have been blackguarding
we couldn't have been blackguarding
you couldn't have been blackguarding
they couldn't have been blackguarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I blackguard?
could you blackguard?
could he blackguard?
could we blackguard?
could you blackguard?
could they blackguard? 	could I be blackguarding?
could you be blackguarding?
could he be blackguarding?
could we be blackguarding?
could you be blackguarding?
could they be blackguarding? 	could I have blackguarded?
could you have blackguarded?
could he have blackguarded?
could we have blackguarded?
could you have blackguarded?
could they have blackguarded? 	could I have been blackguarding?
could you have been blackguarding?
could he have been blackguarding?
could we have been blackguarding?
could you have been blackguarding?
could they have been blackguarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I blackguard?
couldn't you blackguard?
couldn't he blackguard?
couldn't we blackguard?
couldn't you blackguard?
couldn't they blackguard? 	couldn't I be blackguarding?
couldn't you be blackguarding?
couldn't he be blackguarding?
couldn't we be blackguarding?
couldn't you be blackguarding?
couldn't they be blackguarding? 	couldn't I have blackguarded?
couldn't you have blackguarded?
couldn't he have blackguarded?
couldn't we have blackguarded?
couldn't you have blackguarded?
couldn't they have blackguarded? 	couldn't I have been blackguarding?
couldn't you have been blackguarding?
couldn't he have been blackguarding?
couldn't we have been blackguarding?
couldn't you have been blackguarding?
couldn't they have been blackguarding?