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