I could bicker you could bicker she could bicker we could bicker you could bicker they could bicker
V-ing form
I could be bickering you could be bickering she could be bickering we could be bickering you could be bickering they could be bickering
Perfect
I could have bickered you could have bickered she could have bickered we could have bickered you could have bickered they could have bickered
V-ing perfect
I could have been bickering you could have been bickering she could have been bickering we could have been bickering you could have been bickering they could have been bickering
Negation
Simple form
I could not bicker you could not bicker she could not bicker we could not bicker you could not bicker they could not bicker
V-ing form
I could not be bickering you could not be bickering she could not be bickering we could not be bickering you could not be bickering they could not be bickering
Perfect
I could not have bickered you could not have bickered she could not have bickered we could not have bickered you could not have bickered they could not have bickered
V-ing perfect
I could not have been bickering you could not have been bickering she could not have been bickering we could not have been bickering you could not have been bickering they could not have been bickering
Interrogative form
Simple form
could I bicker? could you bicker? could she bicker? could we bicker? could you bicker? could they bicker?
V-ing form
could I be bickering? could you be bickering? could she be bickering? could we be bickering? could you be bickering? could they be bickering?
Perfect
could I have bickered? could you have bickered? could she have bickered? could we have bickered? could you have bickered? could they have bickered?
V-ing perfect
could I have been bickering? could you have been bickering? could she have been bickering? could we have been bickering? could you have been bickering? could they have been bickering?
Interro-negative form
Simple form
could I not bicker? could you not bicker? could she not bicker? could we not bicker? could you not bicker? could they not bicker?
V-ing form
could I not be bickering? could you not be bickering? could she not be bickering? could we not be bickering? could you not be bickering? could they not be bickering?
Perfect
could I not have bickered? could you not have bickered? could she not have bickered? could we not have bickered? could you not have bickered? could they not have bickered?
V-ing perfect
could I not have been bickering? could you not have been bickering? could she not have been bickering? could we not have been bickering? could you not have been bickering? could they not have been bickering?