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