I can occupy you can occupy he can occupy we can occupy you can occupy they can occupy
V-ing form
I can be occupying you can be occupying he can be occupying we can be occupying you can be occupying they can be occupying
Perfect
I can have occupied you can have occupied he can have occupied we can have occupied you can have occupied they can have occupied
V-ing perfect
I can have been occupying you can have been occupying he can have been occupying we can have been occupying you can have been occupying they can have been occupying
Negation
Simple form
I cannot occupy you cannot occupy he cannot occupy we cannot occupy you cannot occupy they cannot occupy
V-ing form
I cannot be occupying you cannot be occupying he cannot be occupying we cannot be occupying you cannot be occupying they cannot be occupying
Perfect
I cannot have occupied you cannot have occupied he cannot have occupied we cannot have occupied you cannot have occupied they cannot have occupied
V-ing perfect
I cannot have been occupying you cannot have been occupying he cannot have been occupying we cannot have been occupying you cannot have been occupying they cannot have been occupying
Interrogative form
Simple form
can I occupy? can you occupy? can he occupy? can we occupy? can you occupy? can they occupy?
V-ing form
can I be occupying? can you be occupying? can he be occupying? can we be occupying? can you be occupying? can they be occupying?
Perfect
can I have occupied? can you have occupied? can he have occupied? can we have occupied? can you have occupied? can they have occupied?
V-ing perfect
can I have been occupying? can you have been occupying? can he have been occupying? can we have been occupying? can you have been occupying? can they have been occupying?
Interro-negative form
Simple form
can I not occupy? can you not occupy? can he not occupy? can we not occupy? can you not occupy? can they not occupy?
V-ing form
can I not be occupying? can you not be occupying? can he not be occupying? can we not be occupying? can you not be occupying? can they not be occupying?
Perfect
can I not have occupied? can you not have occupied? can he not have occupied? can we not have occupied? can you not have occupied? can they not have occupied?
V-ing perfect
can I not have been occupying? can you not have been occupying? can he not have been occupying? can we not have been occupying? can you not have been occupying? can they not have been occupying?