English verb conjugation
COULD PLACE

Regular verb: place - placed - placed

Affirmation

Simple form	V-ing form
I could place you could place he could place we could place you could place they could place	I could be placing you could be placing he could be placing we could be placing you could be placing they could be placing
Perfect	V-ing perfect
I could have placed you could have placed he could have placed we could have placed you could have placed they could have placed	I could have been placing you could have been placing he could have been placing we could have been placing you could have been placing they could have been placing

Negation

Simple form	V-ing form
I could not place you could not place he could not place we could not place you could not place they could not place	I could not be placing you could not be placing he could not be placing we could not be placing you could not be placing they could not be placing
Perfect	V-ing perfect
I could not have placed you could not have placed he could not have placed we could not have placed you could not have placed they could not have placed	I could not have been placing you could not have been placing he could not have been placing we could not have been placing you could not have been placing they could not have been placing

Interrogative form

Simple form	V-ing form
could I place? could you place? could he place? could we place? could you place? could they place?	could I be placing? could you be placing? could he be placing? could we be placing? could you be placing? could they be placing?
Perfect	V-ing perfect
could I have placed? could you have placed? could he have placed? could we have placed? could you have placed? could they have placed?	could I have been placing? could you have been placing? could he have been placing? could we have been placing? could you have been placing? could they have been placing?

Interro-negative form

Simple form	V-ing form
could I not place? could you not place? could he not place? could we not place? could you not place? could they not place?	could I not be placing? could you not be placing? could he not be placing? could we not be placing? could you not be placing? could they not be placing?
Perfect	V-ing perfect
could I not have placed? could you not have placed? could he not have placed? could we not have placed? could you not have placed? could they not have placed?	could I not have been placing? could you not have been placing? could he not have been placing? could we not have been placing? could you not have been placing? could they not have been placing?