I must blackmail you must blackmail she must blackmail we must blackmail you must blackmail they must blackmail
V-ing form
I must be blackmailing you must be blackmailing she must be blackmailing we must be blackmailing you must be blackmailing they must be blackmailing
Perfect
I must have blackmailed you must have blackmailed she 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 she must have been blackmailing we must have been blackmailing you must have been blackmailing they must have been blackmailing
Negation
Simple form
I mustn't blackmail you mustn't blackmail she mustn't blackmail we mustn't blackmail you mustn't blackmail they mustn't blackmail
V-ing form
I mustn't be blackmailing you mustn't be blackmailing she mustn't be blackmailing we mustn't be blackmailing you mustn't be blackmailing they mustn't be blackmailing
Perfect
I mustn't have blackmailed you mustn't have blackmailed she mustn't have blackmailed we mustn't have blackmailed you mustn't have blackmailed they mustn't have blackmailed
V-ing perfect
I mustn't have been blackmailing you mustn't have been blackmailing she mustn't have been blackmailing we mustn't have been blackmailing you mustn't have been blackmailing they mustn't have been blackmailing
Interrogative form
Simple form
must I blackmail? must you blackmail? must she blackmail? must we blackmail? must you blackmail? must they blackmail?
V-ing form
must I be blackmailing? must you be blackmailing? must she be blackmailing? must we be blackmailing? must you be blackmailing? must they be blackmailing?
Perfect
must I have blackmailed? must you have blackmailed? must she 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 she have been blackmailing? must we have been blackmailing? must you have been blackmailing? must they have been blackmailing?
Interro-negative form
Simple form
mustn't I blackmail? mustn't you blackmail? mustn't she blackmail? mustn't we blackmail? mustn't you blackmail? mustn't they blackmail?
V-ing form
mustn't I be blackmailing? mustn't you be blackmailing? mustn't she be blackmailing? mustn't we be blackmailing? mustn't you be blackmailing? mustn't they be blackmailing?
Perfect
mustn't I have blackmailed? mustn't you have blackmailed? mustn't she have blackmailed? mustn't we have blackmailed? mustn't you have blackmailed? mustn't they have blackmailed?
V-ing perfect
mustn't I have been blackmailing? mustn't you have been blackmailing? mustn't she have been blackmailing? mustn't we have been blackmailing? mustn't you have been blackmailing? mustn't they have been blackmailing?