Regular verb: billboard - billboarded - billboarded
Affirmation
Simple form
I could billboard you could billboard she could billboard we could billboard you could billboard they could billboard
V-ing form
I could be billboarding you could be billboarding she could be billboarding we could be billboarding you could be billboarding they could be billboarding
Perfect
I could have billboarded you could have billboarded she could have billboarded we could have billboarded you could have billboarded they could have billboarded
V-ing perfect
I could have been billboarding you could have been billboarding she could have been billboarding we could have been billboarding you could have been billboarding they could have been billboarding
Negation
Simple form
I could not billboard you could not billboard she could not billboard we could not billboard you could not billboard they could not billboard
V-ing form
I could not be billboarding you could not be billboarding she could not be billboarding we could not be billboarding you could not be billboarding they could not be billboarding
Perfect
I could not have billboarded you could not have billboarded she could not have billboarded we could not have billboarded you could not have billboarded they could not have billboarded
V-ing perfect
I could not have been billboarding you could not have been billboarding she could not have been billboarding we could not have been billboarding you could not have been billboarding they could not have been billboarding
Interrogative form
Simple form
could I billboard? could you billboard? could she billboard? could we billboard? could you billboard? could they billboard?
V-ing form
could I be billboarding? could you be billboarding? could she be billboarding? could we be billboarding? could you be billboarding? could they be billboarding?
Perfect
could I have billboarded? could you have billboarded? could she have billboarded? could we have billboarded? could you have billboarded? could they have billboarded?
V-ing perfect
could I have been billboarding? could you have been billboarding? could she have been billboarding? could we have been billboarding? could you have been billboarding? could they have been billboarding?
Interro-negative form
Simple form
could I not billboard? could you not billboard? could she not billboard? could we not billboard? could you not billboard? could they not billboard?
V-ing form
could I not be billboarding? could you not be billboarding? could she not be billboarding? could we not be billboarding? could you not be billboarding? could they not be billboarding?
Perfect
could I not have billboarded? could you not have billboarded? could she not have billboarded? could we not have billboarded? could you not have billboarded? could they not have billboarded?
V-ing perfect
could I not have been billboarding? could you not have been billboarding? could she not have been billboarding? could we not have been billboarding? could you not have been billboarding? could they not have been billboarding?