can blackguard
Regular verb: blackguard - blackguarded- blackguarded

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

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

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

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