I can possess you can possess she can possess we can possess you can possess they can possess
V-ing form
I can be possessing you can be possessing she can be possessing we can be possessing you can be possessing they can be possessing
Perfect
I can have possessed you can have possessed she 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 she can have been possessing we can have been possessing you can have been possessing they can have been possessing
Negation
Simple form
I cannot possess you cannot possess she cannot possess we cannot possess you cannot possess they cannot possess
V-ing form
I cannot be possessing you cannot be possessing she cannot be possessing we cannot be possessing you cannot be possessing they cannot be possessing
Perfect
I cannot have possessed you cannot have possessed she cannot have possessed we cannot have possessed you cannot have possessed they cannot have possessed
V-ing perfect
I cannot have been possessing you cannot have been possessing she cannot have been possessing we cannot have been possessing you cannot have been possessing they cannot have been possessing
Interrogative form
Simple form
can I possess? can you possess? can she possess? can we possess? can you possess? can they possess?
V-ing form
can I be possessing? can you be possessing? can she be possessing? can we be possessing? can you be possessing? can they be possessing?
Perfect
can I have possessed? can you have possessed? can she 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 she have been possessing? can we have been possessing? can you have been possessing? can they have been possessing?
Interro-negative form
Simple form
can I not possess? can you not possess? can she not possess? can we not possess? can you not possess? can they not possess?
V-ing form
can I not be possessing? can you not be possessing? can she not be possessing? can we not be possessing? can you not be possessing? can they not be possessing?
Perfect
can I not have possessed? can you not have possessed? can she not have possessed? can we not have possessed? can you not have possessed? can they not have possessed?
V-ing perfect
can I not have been possessing? can you not have been possessing? can she not have been possessing? can we not have been possessing? can you not have been possessing? can they not have been possessing?