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 couldn't bicker you couldn't bicker she couldn't bicker we couldn't bicker you couldn't bicker they couldn't bicker
V-ing form
I couldn't be bickering you couldn't be bickering she couldn't be bickering we couldn't be bickering you couldn't be bickering they couldn't be bickering
Perfect
I couldn't have bickered you couldn't have bickered she couldn't have bickered we couldn't have bickered you couldn't have bickered they couldn't have bickered
V-ing perfect
I couldn't have been bickering you couldn't have been bickering she couldn't have been bickering we couldn't have been bickering you couldn't have been bickering they couldn't 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
couldn't I bicker? couldn't you bicker? couldn't she bicker? couldn't we bicker? couldn't you bicker? couldn't they bicker?
V-ing form
couldn't I be bickering? couldn't you be bickering? couldn't she be bickering? couldn't we be bickering? couldn't you be bickering? couldn't they be bickering?
Perfect
couldn't I have bickered? couldn't you have bickered? couldn't she have bickered? couldn't we have bickered? couldn't you have bickered? couldn't they have bickered?
V-ing perfect
couldn't I have been bickering? couldn't you have been bickering? couldn't she have been bickering? couldn't we have been bickering? couldn't you have been bickering? couldn't they have been bickering?