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 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
Perfect	V-ing perfect
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
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
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?
Perfect	V-ing perfect
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?