must counterfeit
Regular verb: counterfeit - counterfeited- counterfeited

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must counterfeit
you must counterfeit
she must counterfeit
we must counterfeit
you must counterfeit
they must counterfeit 	I must be counterfeiting
you must be counterfeiting
she must be counterfeiting
we must be counterfeiting
you must be counterfeiting
they must be counterfeiting	I must have counterfeited
you must have counterfeited
she must have counterfeited
we must have counterfeited
you must have counterfeited
they must have counterfeited	I must have been counterfeiting
you must have been counterfeiting
she must have been counterfeiting
we must have been counterfeiting
you must have been counterfeiting
they must have been counterfeiting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not counterfeit
you must not counterfeit
she must not counterfeit
we must not counterfeit
you must not counterfeit
they must not counterfeit 	I must not be counterfeiting
you must not be counterfeiting
she must not be counterfeiting
we must not be counterfeiting
you must not be counterfeiting
they must not be counterfeiting	I must not have counterfeited
you must not have counterfeited
she must not have counterfeited
we must not have counterfeited
you must not have counterfeited
they must not have counterfeited	I must not have been counterfeiting
you must not have been counterfeiting
she must not have been counterfeiting
we must not have been counterfeiting
you must not have been counterfeiting
they must not have been counterfeiting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I counterfeit?
must you counterfeit?
must she counterfeit?
must we counterfeit?
must you counterfeit?
must they counterfeit? 	must I be counterfeiting?
must you be counterfeiting?
must she be counterfeiting?
must we be counterfeiting?
must you be counterfeiting?
must they be counterfeiting? 	must I have counterfeited?
must you have counterfeited?
must she have counterfeited?
must we have counterfeited?
must you have counterfeited?
must they have counterfeited? 	must I have been counterfeiting?
must you have been counterfeiting?
must she have been counterfeiting?
must we have been counterfeiting?
must you have been counterfeiting?
must they have been counterfeiting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not counterfeit?
must you not counterfeit?
must she not counterfeit?
must we not counterfeit?
must you not counterfeit?
must they not counterfeit? 	must I not be counterfeiting?
must you not be counterfeiting?
must she not be counterfeiting?
must we not be counterfeiting?
must you not be counterfeiting?
must they not be counterfeiting? 	must I not have counterfeited?
must you not have counterfeited?
must she not have counterfeited?
must we not have counterfeited?
must you not have counterfeited?
must they not have counterfeited? 	must I not have been counterfeiting?
must you not have been counterfeiting?
must she not have been counterfeiting?
must we not have been counterfeiting?
must you not have been counterfeiting?
must they not have been counterfeiting?