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