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