I can jabber you can jabber he can jabber we can jabber you can jabber they can jabber
V-ing form
I can be jabbering you can be jabbering he can be jabbering we can be jabbering you can be jabbering they can be jabbering
Perfect
I can have jabbered you can have jabbered he can have jabbered we can have jabbered you can have jabbered they can have jabbered
V-ing perfect
I can have been jabbering you can have been jabbering he can have been jabbering we can have been jabbering you can have been jabbering they can have been jabbering
Negation
Simple form
I cannot jabber you cannot jabber he cannot jabber we cannot jabber you cannot jabber they cannot jabber
V-ing form
I cannot be jabbering you cannot be jabbering he cannot be jabbering we cannot be jabbering you cannot be jabbering they cannot be jabbering
Perfect
I cannot have jabbered you cannot have jabbered he cannot have jabbered we cannot have jabbered you cannot have jabbered they cannot have jabbered
V-ing perfect
I cannot have been jabbering you cannot have been jabbering he cannot have been jabbering we cannot have been jabbering you cannot have been jabbering they cannot have been jabbering
Interrogative form
Simple form
can I jabber? can you jabber? can he jabber? can we jabber? can you jabber? can they jabber?
V-ing form
can I be jabbering? can you be jabbering? can he be jabbering? can we be jabbering? can you be jabbering? can they be jabbering?
Perfect
can I have jabbered? can you have jabbered? can he have jabbered? can we have jabbered? can you have jabbered? can they have jabbered?
V-ing perfect
can I have been jabbering? can you have been jabbering? can he have been jabbering? can we have been jabbering? can you have been jabbering? can they have been jabbering?
Interro-negative form
Simple form
can I not jabber? can you not jabber? can he not jabber? can we not jabber? can you not jabber? can they not jabber?
V-ing form
can I not be jabbering? can you not be jabbering? can he not be jabbering? can we not be jabbering? can you not be jabbering? can they not be jabbering?
Perfect
can I not have jabbered? can you not have jabbered? can he not have jabbered? can we not have jabbered? can you not have jabbered? can they not have jabbered?
V-ing perfect
can I not have been jabbering? can you not have been jabbering? can he not have been jabbering? can we not have been jabbering? can you not have been jabbering? can they not have been jabbering?