I could coil you could coil she could coil we could coil you could coil they could coil
V-ing form
I could be coiling you could be coiling she could be coiling we could be coiling you could be coiling they could be coiling
Perfect
I could have coiled you could have coiled she could have coiled we could have coiled you could have coiled they could have coiled
V-ing perfect
I could have been coiling you could have been coiling she could have been coiling we could have been coiling you could have been coiling they could have been coiling
Negation
Simple form
I could not coil you could not coil she could not coil we could not coil you could not coil they could not coil
V-ing form
I could not be coiling you could not be coiling she could not be coiling we could not be coiling you could not be coiling they could not be coiling
Perfect
I could not have coiled you could not have coiled she could not have coiled we could not have coiled you could not have coiled they could not have coiled
V-ing perfect
I could not have been coiling you could not have been coiling she could not have been coiling we could not have been coiling you could not have been coiling they could not have been coiling
Interrogative form
Simple form
could I coil? could you coil? could she coil? could we coil? could you coil? could they coil?
V-ing form
could I be coiling? could you be coiling? could she be coiling? could we be coiling? could you be coiling? could they be coiling?
Perfect
could I have coiled? could you have coiled? could she have coiled? could we have coiled? could you have coiled? could they have coiled?
V-ing perfect
could I have been coiling? could you have been coiling? could she have been coiling? could we have been coiling? could you have been coiling? could they have been coiling?
Interro-negative form
Simple form
could I not coil? could you not coil? could she not coil? could we not coil? could you not coil? could they not coil?
V-ing form
could I not be coiling? could you not be coiling? could she not be coiling? could we not be coiling? could you not be coiling? could they not be coiling?
Perfect
could I not have coiled? could you not have coiled? could she not have coiled? could we not have coiled? could you not have coiled? could they not have coiled?
V-ing perfect
could I not have been coiling? could you not have been coiling? could she not have been coiling? could we not have been coiling? could you not have been coiling? could they not have been coiling?