I could wager you could wager he could wager we could wager you could wager they could wager
V-ing form
I could be wagering you could be wagering he could be wagering we could be wagering you could be wagering they could be wagering
Perfect
I could have wagered you could have wagered he 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 he 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 he 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 he 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 he 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 he 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 he wager? could we wager? could you wager? could they wager?
V-ing form
could I be wagering? could you be wagering? could he be wagering? could we be wagering? could you be wagering? could they be wagering?
Perfect
could I have wagered? could you have wagered? could he 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 he 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 he 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 he 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 he 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 he have been wagering? couldn't we have been wagering? couldn't you have been wagering? couldn't they have been wagering?