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