I could blackmail you could blackmail he could blackmail we could blackmail you could blackmail they could blackmail
V-ing form
I could be blackmailing you could be blackmailing he could be blackmailing we could be blackmailing you could be blackmailing they could be blackmailing
Perfect
I could have blackmailed you could have blackmailed he could have blackmailed we could have blackmailed you could have blackmailed they could have blackmailed
V-ing perfect
I could have been blackmailing you could have been blackmailing he could have been blackmailing we could have been blackmailing you could have been blackmailing they could have been blackmailing
Negation
Simple form
I could not blackmail you could not blackmail he could not blackmail we could not blackmail you could not blackmail they could not blackmail
V-ing form
I could not be blackmailing you could not be blackmailing he could not be blackmailing we could not be blackmailing you could not be blackmailing they could not be blackmailing
Perfect
I could not have blackmailed you could not have blackmailed he could not have blackmailed we could not have blackmailed you could not have blackmailed they could not have blackmailed
V-ing perfect
I could not have been blackmailing you could not have been blackmailing he could not have been blackmailing we could not have been blackmailing you could not have been blackmailing they could not have been blackmailing
Interrogative form
Simple form
could I blackmail? could you blackmail? could he blackmail? could we blackmail? could you blackmail? could they blackmail?
V-ing form
could I be blackmailing? could you be blackmailing? could he be blackmailing? could we be blackmailing? could you be blackmailing? could they be blackmailing?
Perfect
could I have blackmailed? could you have blackmailed? could he have blackmailed? could we have blackmailed? could you have blackmailed? could they have blackmailed?
V-ing perfect
could I have been blackmailing? could you have been blackmailing? could he have been blackmailing? could we have been blackmailing? could you have been blackmailing? could they have been blackmailing?
Interro-negative form
Simple form
could I not blackmail? could you not blackmail? could he not blackmail? could we not blackmail? could you not blackmail? could they not blackmail?
V-ing form
could I not be blackmailing? could you not be blackmailing? could he not be blackmailing? could we not be blackmailing? could you not be blackmailing? could they not be blackmailing?
Perfect
could I not have blackmailed? could you not have blackmailed? could he not have blackmailed? could we not have blackmailed? could you not have blackmailed? could they not have blackmailed?
V-ing perfect
could I not have been blackmailing? could you not have been blackmailing? could he not have been blackmailing? could we not have been blackmailing? could you not have been blackmailing? could they not have been blackmailing?