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