English verb conjugation
COULD POLYGRAPH

Regular verb: polygraph - polygraphed - polygraphed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not polygraph you could not polygraph she could not polygraph we could not polygraph you could not polygraph they could not polygraph	I could not be polygraphing you could not be polygraphing she could not be polygraphing we could not be polygraphing you could not be polygraphing they could not be polygraphing
Perfect	V-ing perfect
I could not have polygraphed you could not have polygraphed she could not have polygraphed we could not have polygraphed you could not have polygraphed they could not have polygraphed	I could not have been polygraphing you could not have been polygraphing she could not have been polygraphing we could not have been polygraphing you could not have been polygraphing they could not have been polygraphing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not polygraph? could you not polygraph? could she not polygraph? could we not polygraph? could you not polygraph? could they not polygraph?	could I not be polygraphing? could you not be polygraphing? could she not be polygraphing? could we not be polygraphing? could you not be polygraphing? could they not be polygraphing?
Perfect	V-ing perfect
could I not have polygraphed? could you not have polygraphed? could she not have polygraphed? could we not have polygraphed? could you not have polygraphed? could they not have polygraphed?	could I not have been polygraphing? could you not have been polygraphing? could she not have been polygraphing? could we not have been polygraphing? could you not have been polygraphing? could they not have been polygraphing?