I could harpoon you could harpoon he could harpoon we could harpoon you could harpoon they could harpoon
V-ing form
I could be harpooning you could be harpooning he could be harpooning we could be harpooning you could be harpooning they could be harpooning
Perfect
I could have harpooned you could have harpooned he could have harpooned we could have harpooned you could have harpooned they could have harpooned
V-ing perfect
I could have been harpooning you could have been harpooning he could have been harpooning we could have been harpooning you could have been harpooning they could have been harpooning
Negation
Simple form
I could not harpoon you could not harpoon he could not harpoon we could not harpoon you could not harpoon they could not harpoon
V-ing form
I could not be harpooning you could not be harpooning he could not be harpooning we could not be harpooning you could not be harpooning they could not be harpooning
Perfect
I could not have harpooned you could not have harpooned he could not have harpooned we could not have harpooned you could not have harpooned they could not have harpooned
V-ing perfect
I could not have been harpooning you could not have been harpooning he could not have been harpooning we could not have been harpooning you could not have been harpooning they could not have been harpooning
Interrogative form
Simple form
could I harpoon? could you harpoon? could he harpoon? could we harpoon? could you harpoon? could they harpoon?
V-ing form
could I be harpooning? could you be harpooning? could he be harpooning? could we be harpooning? could you be harpooning? could they be harpooning?
Perfect
could I have harpooned? could you have harpooned? could he have harpooned? could we have harpooned? could you have harpooned? could they have harpooned?
V-ing perfect
could I have been harpooning? could you have been harpooning? could he have been harpooning? could we have been harpooning? could you have been harpooning? could they have been harpooning?
Interro-negative form
Simple form
could I not harpoon? could you not harpoon? could he not harpoon? could we not harpoon? could you not harpoon? could they not harpoon?
V-ing form
could I not be harpooning? could you not be harpooning? could he not be harpooning? could we not be harpooning? could you not be harpooning? could they not be harpooning?
Perfect
could I not have harpooned? could you not have harpooned? could he not have harpooned? could we not have harpooned? could you not have harpooned? could they not have harpooned?
V-ing perfect
could I not have been harpooning? could you not have been harpooning? could he not have been harpooning? could we not have been harpooning? could you not have been harpooning? could they not have been harpooning?