English verb conjugation
COULD POLYGRAPH

Regular verb: polygraph - polygraphed - polygraphed

Affirmation

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