could counterfeit
Regular verb: counterfeit - counterfeited- counterfeited

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't counterfeit
you couldn't counterfeit
she couldn't counterfeit
we couldn't counterfeit
you couldn't counterfeit
they couldn't counterfeit 	I couldn't be counterfeiting
you couldn't be counterfeiting
she couldn't be counterfeiting
we couldn't be counterfeiting
you couldn't be counterfeiting
they couldn't be counterfeiting	I couldn't have counterfeited
you couldn't have counterfeited
she couldn't have counterfeited
we couldn't have counterfeited
you couldn't have counterfeited
they couldn't have counterfeited	I couldn't have been counterfeiting
you couldn't have been counterfeiting
she couldn't have been counterfeiting
we couldn't have been counterfeiting
you couldn't have been counterfeiting
they couldn't have been counterfeiting	

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

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