I could bleed you could bleed she could bleed we could bleed you could bleed they could bleed
V-ing form
I could be bleeding you could be bleeding she could be bleeding we could be bleeding you could be bleeding they could be bleeding
Perfect
I could have bled you could have bled she 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 she 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 she 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 she 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 she 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 she 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 she bleed? could we bleed? could you bleed? could they bleed?
V-ing form
could I be bleeding? could you be bleeding? could she be bleeding? could we be bleeding? could you be bleeding? could they be bleeding?
Perfect
could I have bled? could you have bled? could she 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 she 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 she 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 she 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 she 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 she have been bleeding? couldn't we have been bleeding? couldn't you have been bleeding? couldn't they have been bleeding?