I could reregister you could reregister he could reregister we could reregister you could reregister they could reregister
V-ing form
I could be reregistering you could be reregistering he could be reregistering we could be reregistering you could be reregistering they could be reregistering
Perfect
I could have reregistered you could have reregistered he could have reregistered we could have reregistered you could have reregistered they could have reregistered
V-ing perfect
I could have been reregistering you could have been reregistering he could have been reregistering we could have been reregistering you could have been reregistering they could have been reregistering
Negation
Simple form
I couldn't reregister you couldn't reregister he couldn't reregister we couldn't reregister you couldn't reregister they couldn't reregister
V-ing form
I couldn't be reregistering you couldn't be reregistering he couldn't be reregistering we couldn't be reregistering you couldn't be reregistering they couldn't be reregistering
Perfect
I couldn't have reregistered you couldn't have reregistered he couldn't have reregistered we couldn't have reregistered you couldn't have reregistered they couldn't have reregistered
V-ing perfect
I couldn't have been reregistering you couldn't have been reregistering he couldn't have been reregistering we couldn't have been reregistering you couldn't have been reregistering they couldn't have been reregistering
Interrogative form
Simple form
could I reregister? could you reregister? could he reregister? could we reregister? could you reregister? could they reregister?
V-ing form
could I be reregistering? could you be reregistering? could he be reregistering? could we be reregistering? could you be reregistering? could they be reregistering?
Perfect
could I have reregistered? could you have reregistered? could he have reregistered? could we have reregistered? could you have reregistered? could they have reregistered?
V-ing perfect
could I have been reregistering? could you have been reregistering? could he have been reregistering? could we have been reregistering? could you have been reregistering? could they have been reregistering?
Interro-negative form
Simple form
couldn't I reregister? couldn't you reregister? couldn't he reregister? couldn't we reregister? couldn't you reregister? couldn't they reregister?
V-ing form
couldn't I be reregistering? couldn't you be reregistering? couldn't he be reregistering? couldn't we be reregistering? couldn't you be reregistering? couldn't they be reregistering?
Perfect
couldn't I have reregistered? couldn't you have reregistered? couldn't he have reregistered? couldn't we have reregistered? couldn't you have reregistered? couldn't they have reregistered?
V-ing perfect
couldn't I have been reregistering? couldn't you have been reregistering? couldn't he have been reregistering? couldn't we have been reregistering? couldn't you have been reregistering? couldn't they have been reregistering?