I could occupy you could occupy she could occupy we could occupy you could occupy they could occupy
V-ing form
I could be occupying you could be occupying she could be occupying we could be occupying you could be occupying they could be occupying
Perfect
I could have occupied you could have occupied she could have occupied we could have occupied you could have occupied they could have occupied
V-ing perfect
I could have been occupying you could have been occupying she could have been occupying we could have been occupying you could have been occupying they could have been occupying
Negation
Simple form
I couldn't occupy you couldn't occupy she couldn't occupy we couldn't occupy you couldn't occupy they couldn't occupy
V-ing form
I couldn't be occupying you couldn't be occupying she couldn't be occupying we couldn't be occupying you couldn't be occupying they couldn't be occupying
Perfect
I couldn't have occupied you couldn't have occupied she couldn't have occupied we couldn't have occupied you couldn't have occupied they couldn't have occupied
V-ing perfect
I couldn't have been occupying you couldn't have been occupying she couldn't have been occupying we couldn't have been occupying you couldn't have been occupying they couldn't have been occupying
Interrogative form
Simple form
could I occupy? could you occupy? could she occupy? could we occupy? could you occupy? could they occupy?
V-ing form
could I be occupying? could you be occupying? could she be occupying? could we be occupying? could you be occupying? could they be occupying?
Perfect
could I have occupied? could you have occupied? could she have occupied? could we have occupied? could you have occupied? could they have occupied?
V-ing perfect
could I have been occupying? could you have been occupying? could she have been occupying? could we have been occupying? could you have been occupying? could they have been occupying?
Interro-negative form
Simple form
couldn't I occupy? couldn't you occupy? couldn't she occupy? couldn't we occupy? couldn't you occupy? couldn't they occupy?
V-ing form
couldn't I be occupying? couldn't you be occupying? couldn't she be occupying? couldn't we be occupying? couldn't you be occupying? couldn't they be occupying?
Perfect
couldn't I have occupied? couldn't you have occupied? couldn't she have occupied? couldn't we have occupied? couldn't you have occupied? couldn't they have occupied?
V-ing perfect
couldn't I have been occupying? couldn't you have been occupying? couldn't she have been occupying? couldn't we have been occupying? couldn't you have been occupying? couldn't they have been occupying?