English verb conjugation
CAN PLACE

Regular verb: place - placed - placed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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