I could bilge you could bilge he could bilge we could bilge you could bilge they could bilge
V-ing form
I could be bilging you could be bilging he could be bilging we could be bilging you could be bilging they could be bilging
Perfect
I could have bilged you could have bilged he could have bilged we could have bilged you could have bilged they could have bilged
V-ing perfect
I could have been bilging you could have been bilging he could have been bilging we could have been bilging you could have been bilging they could have been bilging
Negation
Simple form
I couldn't bilge you couldn't bilge he couldn't bilge we couldn't bilge you couldn't bilge they couldn't bilge
V-ing form
I couldn't be bilging you couldn't be bilging he couldn't be bilging we couldn't be bilging you couldn't be bilging they couldn't be bilging
Perfect
I couldn't have bilged you couldn't have bilged he couldn't have bilged we couldn't have bilged you couldn't have bilged they couldn't have bilged
V-ing perfect
I couldn't have been bilging you couldn't have been bilging he couldn't have been bilging we couldn't have been bilging you couldn't have been bilging they couldn't have been bilging
Interrogative form
Simple form
could I bilge? could you bilge? could he bilge? could we bilge? could you bilge? could they bilge?
V-ing form
could I be bilging? could you be bilging? could he be bilging? could we be bilging? could you be bilging? could they be bilging?
Perfect
could I have bilged? could you have bilged? could he have bilged? could we have bilged? could you have bilged? could they have bilged?
V-ing perfect
could I have been bilging? could you have been bilging? could he have been bilging? could we have been bilging? could you have been bilging? could they have been bilging?
Interro-negative form
Simple form
couldn't I bilge? couldn't you bilge? couldn't he bilge? couldn't we bilge? couldn't you bilge? couldn't they bilge?
V-ing form
couldn't I be bilging? couldn't you be bilging? couldn't he be bilging? couldn't we be bilging? couldn't you be bilging? couldn't they be bilging?
Perfect
couldn't I have bilged? couldn't you have bilged? couldn't he have bilged? couldn't we have bilged? couldn't you have bilged? couldn't they have bilged?
V-ing perfect
couldn't I have been bilging? couldn't you have been bilging? couldn't he have been bilging? couldn't we have been bilging? couldn't you have been bilging? couldn't they have been bilging?