I can window-shop you can window-shop she can window-shop we can window-shop you can window-shop they can window-shop
V-ing form
I can be window-shoping you can be window-shoping she can be window-shoping we can be window-shoping you can be window-shoping they can be window-shoping
Perfect
I can have window-shoped you can have window-shoped she can have window-shoped we can have window-shoped you can have window-shoped they can have window-shoped
V-ing perfect
I can have been window-shoping you can have been window-shoping she can have been window-shoping we can have been window-shoping you can have been window-shoping they can have been window-shoping
Negation
Simple form
I cannot window-shop you cannot window-shop she cannot window-shop we cannot window-shop you cannot window-shop they cannot window-shop
V-ing form
I cannot be window-shoping you cannot be window-shoping she cannot be window-shoping we cannot be window-shoping you cannot be window-shoping they cannot be window-shoping
Perfect
I cannot have window-shoped you cannot have window-shoped she cannot have window-shoped we cannot have window-shoped you cannot have window-shoped they cannot have window-shoped
V-ing perfect
I cannot have been window-shoping you cannot have been window-shoping she cannot have been window-shoping we cannot have been window-shoping you cannot have been window-shoping they cannot have been window-shoping
Interrogative form
Simple form
can I window-shop? can you window-shop? can she window-shop? can we window-shop? can you window-shop? can they window-shop?
V-ing form
can I be window-shoping? can you be window-shoping? can she be window-shoping? can we be window-shoping? can you be window-shoping? can they be window-shoping?
Perfect
can I have window-shoped? can you have window-shoped? can she have window-shoped? can we have window-shoped? can you have window-shoped? can they have window-shoped?
V-ing perfect
can I have been window-shoping? can you have been window-shoping? can she have been window-shoping? can we have been window-shoping? can you have been window-shoping? can they have been window-shoping?
Interro-negative form
Simple form
can I not window-shop? can you not window-shop? can she not window-shop? can we not window-shop? can you not window-shop? can they not window-shop?
V-ing form
can I not be window-shoping? can you not be window-shoping? can she not be window-shoping? can we not be window-shoping? can you not be window-shoping? can they not be window-shoping?
Perfect
can I not have window-shoped? can you not have window-shoped? can she not have window-shoped? can we not have window-shoped? can you not have window-shoped? can they not have window-shoped?
V-ing perfect
can I not have been window-shoping? can you not have been window-shoping? can she not have been window-shoping? can we not have been window-shoping? can you not have been window-shoping? can they not have been window-shoping?