I must counterfeit you must counterfeit he must counterfeit we must counterfeit you must counterfeit they must counterfeit
V-ing form
I must be counterfeiting you must be counterfeiting he must be counterfeiting we must be counterfeiting you must be counterfeiting they must be counterfeiting
Perfect
I must have counterfeited you must have counterfeited he must have counterfeited we must have counterfeited you must have counterfeited they must have counterfeited
V-ing perfect
I must have been counterfeiting you must have been counterfeiting he must have been counterfeiting we must have been counterfeiting you must have been counterfeiting they must have been counterfeiting
Negation
Simple form
I mustn't counterfeit you mustn't counterfeit he mustn't counterfeit we mustn't counterfeit you mustn't counterfeit they mustn't counterfeit
V-ing form
I mustn't be counterfeiting you mustn't be counterfeiting he mustn't be counterfeiting we mustn't be counterfeiting you mustn't be counterfeiting they mustn't be counterfeiting
Perfect
I mustn't have counterfeited you mustn't have counterfeited he mustn't have counterfeited we mustn't have counterfeited you mustn't have counterfeited they mustn't have counterfeited
V-ing perfect
I mustn't have been counterfeiting you mustn't have been counterfeiting he mustn't have been counterfeiting we mustn't have been counterfeiting you mustn't have been counterfeiting they mustn't have been counterfeiting
Interrogative form
Simple form
must I counterfeit? must you counterfeit? must he counterfeit? must we counterfeit? must you counterfeit? must they counterfeit?
V-ing form
must I be counterfeiting? must you be counterfeiting? must he be counterfeiting? must we be counterfeiting? must you be counterfeiting? must they be counterfeiting?
Perfect
must I have counterfeited? must you have counterfeited? must he have counterfeited? must we have counterfeited? must you have counterfeited? must they have counterfeited?
V-ing perfect
must I have been counterfeiting? must you have been counterfeiting? must he have been counterfeiting? must we have been counterfeiting? must you have been counterfeiting? must they have been counterfeiting?
Interro-negative form
Simple form
mustn't I counterfeit? mustn't you counterfeit? mustn't he counterfeit? mustn't we counterfeit? mustn't you counterfeit? mustn't they counterfeit?
V-ing form
mustn't I be counterfeiting? mustn't you be counterfeiting? mustn't he be counterfeiting? mustn't we be counterfeiting? mustn't you be counterfeiting? mustn't they be counterfeiting?
Perfect
mustn't I have counterfeited? mustn't you have counterfeited? mustn't he have counterfeited? mustn't we have counterfeited? mustn't you have counterfeited? mustn't they have counterfeited?
V-ing perfect
mustn't I have been counterfeiting? mustn't you have been counterfeiting? mustn't he have been counterfeiting? mustn't we have been counterfeiting? mustn't you have been counterfeiting? mustn't they have been counterfeiting?