I can occupy you can occupy she can occupy we can occupy you can occupy they can occupy
V-ing form
I can be occupying you can be occupying she can be occupying we can be occupying you can be occupying they can be occupying
Perfect
I can have occupied you can have occupied she 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 she 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 she cannot occupy we cannot occupy you cannot occupy they cannot occupy
V-ing form
I cannot be occupying you cannot be occupying she cannot be occupying we cannot be occupying you cannot be occupying they cannot be occupying
Perfect
I cannot have occupied you cannot have occupied she 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 she 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 she occupy? can we occupy? can you occupy? can they occupy?
V-ing form
can I be occupying? can you be occupying? can she be occupying? can we be occupying? can you be occupying? can they be occupying?
Perfect
can I have occupied? can you have occupied? can she 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 she 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 she 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 she 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 she 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 she not have been occupying? can we not have been occupying? can you not have been occupying? can they not have been occupying?