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