I can possess you can possess he can possess we can possess you can possess they can possess
V-ing form
I can be possessing you can be possessing he can be possessing we can be possessing you can be possessing they can be possessing
Perfect
I can have possessed you can have possessed he can have possessed we can have possessed you can have possessed they can have possessed
V-ing perfect
I can have been possessing you can have been possessing he can have been possessing we can have been possessing you can have been possessing they can have been possessing
Negation
Simple form
I can't possess you can't possess he can't possess we can't possess you can't possess they can't possess
V-ing form
I can't be possessing you can't be possessing he can't be possessing we can't be possessing you can't be possessing they can't be possessing
Perfect
I can't have possessed you can't have possessed he can't have possessed we can't have possessed you can't have possessed they can't have possessed
V-ing perfect
I can't have been possessing you can't have been possessing he can't have been possessing we can't have been possessing you can't have been possessing they can't have been possessing
Interrogative form
Simple form
can I possess? can you possess? can he possess? can we possess? can you possess? can they possess?
V-ing form
can I be possessing? can you be possessing? can he be possessing? can we be possessing? can you be possessing? can they be possessing?
Perfect
can I have possessed? can you have possessed? can he have possessed? can we have possessed? can you have possessed? can they have possessed?
V-ing perfect
can I have been possessing? can you have been possessing? can he have been possessing? can we have been possessing? can you have been possessing? can they have been possessing?
Interro-negative form
Simple form
can't I possess? can't you possess? can't he possess? can't we possess? can't you possess? can't they possess?
V-ing form
can't I be possessing? can't you be possessing? can't he be possessing? can't we be possessing? can't you be possessing? can't they be possessing?
Perfect
can't I have possessed? can't you have possessed? can't he have possessed? can't we have possessed? can't you have possessed? can't they have possessed?
V-ing perfect
can't I have been possessing? can't you have been possessing? can't he have been possessing? can't we have been possessing? can't you have been possessing? can't they have been possessing?