could polygraph
Regular verb: polygraph - polygraphed- polygraphed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could polygraph
you could polygraph
she could polygraph
we could polygraph
you could polygraph
they could polygraph 	I could be polygraphing
you could be polygraphing
she could be polygraphing
we could be polygraphing
you could be polygraphing
they could be polygraphing	I could have polygraphed
you could have polygraphed
she could have polygraphed
we could have polygraphed
you could have polygraphed
they could have polygraphed	I could have been polygraphing
you could have been polygraphing
she could have been polygraphing
we could have been polygraphing
you could have been polygraphing
they could have been polygraphing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't polygraph
you couldn't polygraph
she couldn't polygraph
we couldn't polygraph
you couldn't polygraph
they couldn't polygraph 	I couldn't be polygraphing
you couldn't be polygraphing
she couldn't be polygraphing
we couldn't be polygraphing
you couldn't be polygraphing
they couldn't be polygraphing	I couldn't have polygraphed
you couldn't have polygraphed
she couldn't have polygraphed
we couldn't have polygraphed
you couldn't have polygraphed
they couldn't have polygraphed	I couldn't have been polygraphing
you couldn't have been polygraphing
she couldn't have been polygraphing
we couldn't have been polygraphing
you couldn't have been polygraphing
they couldn't have been polygraphing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I polygraph?
could you polygraph?
could she polygraph?
could we polygraph?
could you polygraph?
could they polygraph? 	could I be polygraphing?
could you be polygraphing?
could she be polygraphing?
could we be polygraphing?
could you be polygraphing?
could they be polygraphing? 	could I have polygraphed?
could you have polygraphed?
could she have polygraphed?
could we have polygraphed?
could you have polygraphed?
could they have polygraphed? 	could I have been polygraphing?
could you have been polygraphing?
could she have been polygraphing?
could we have been polygraphing?
could you have been polygraphing?
could they have been polygraphing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I polygraph?
couldn't you polygraph?
couldn't she polygraph?
couldn't we polygraph?
couldn't you polygraph?
couldn't they polygraph? 	couldn't I be polygraphing?
couldn't you be polygraphing?
couldn't she be polygraphing?
couldn't we be polygraphing?
couldn't you be polygraphing?
couldn't they be polygraphing? 	couldn't I have polygraphed?
couldn't you have polygraphed?
couldn't she have polygraphed?
couldn't we have polygraphed?
couldn't you have polygraphed?
couldn't they have polygraphed? 	couldn't I have been polygraphing?
couldn't you have been polygraphing?
couldn't she have been polygraphing?
couldn't we have been polygraphing?
couldn't you have been polygraphing?
couldn't they have been polygraphing?