could coil
Regular verb: coil - coiled- coiled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could coil
you could coil
she could coil
we could coil
you could coil
they could coil 	I could be coiling
you could be coiling
she could be coiling
we could be coiling
you could be coiling
they could be coiling	I could have coiled
you could have coiled
she could have coiled
we could have coiled
you could have coiled
they could have coiled	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 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't coil
you couldn't coil
she couldn't coil
we couldn't coil
you couldn't coil
they couldn't coil 	I couldn't be coiling
you couldn't be coiling
she couldn't be coiling
we couldn't be coiling
you couldn't be coiling
they couldn't be coiling	I couldn't have coiled
you couldn't have coiled
she couldn't have coiled
we couldn't have coiled
you couldn't have coiled
they couldn't have coiled	I couldn't have been coiling
you couldn't have been coiling
she couldn't have been coiling
we couldn't have been coiling
you couldn't have been coiling
they couldn't have been coiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I coil?
could you coil?
could she coil?
could we coil?
could you coil?
could they coil? 	could I be coiling?
could you be coiling?
could she be coiling?
could we be coiling?
could you be coiling?
could they be coiling? 	could I have coiled?
could you have coiled?
could she have coiled?
could we have coiled?
could you have coiled?
could they have coiled? 	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 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I coil?
couldn't you coil?
couldn't she coil?
couldn't we coil?
couldn't you coil?
couldn't they coil? 	couldn't I be coiling?
couldn't you be coiling?
couldn't she be coiling?
couldn't we be coiling?
couldn't you be coiling?
couldn't they be coiling? 	couldn't I have coiled?
couldn't you have coiled?
couldn't she have coiled?
couldn't we have coiled?
couldn't you have coiled?
couldn't they have coiled? 	couldn't I have been coiling?
couldn't you have been coiling?
couldn't she have been coiling?
couldn't we have been coiling?
couldn't you have been coiling?
couldn't they have been coiling?