could coin
Regular verb: coin - coined- coined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could coin
you could coin
he could coin
we could coin
you could coin
they could coin 	I could be coining
you could be coining
he could be coining
we could be coining
you could be coining
they could be coining	I could have coined
you could have coined
he could have coined
we could have coined
you could have coined
they could have coined	I could have been coining
you could have been coining
he could have been coining
we could have been coining
you could have been coining
they could have been coining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't coin
you couldn't coin
he couldn't coin
we couldn't coin
you couldn't coin
they couldn't coin 	I couldn't be coining
you couldn't be coining
he couldn't be coining
we couldn't be coining
you couldn't be coining
they couldn't be coining	I couldn't have coined
you couldn't have coined
he couldn't have coined
we couldn't have coined
you couldn't have coined
they couldn't have coined	I couldn't have been coining
you couldn't have been coining
he couldn't have been coining
we couldn't have been coining
you couldn't have been coining
they couldn't have been coining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I coin?
could you coin?
could he coin?
could we coin?
could you coin?
could they coin? 	could I be coining?
could you be coining?
could he be coining?
could we be coining?
could you be coining?
could they be coining? 	could I have coined?
could you have coined?
could he have coined?
could we have coined?
could you have coined?
could they have coined? 	could I have been coining?
could you have been coining?
could he have been coining?
could we have been coining?
could you have been coining?
could they have been coining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I coin?
couldn't you coin?
couldn't he coin?
couldn't we coin?
couldn't you coin?
couldn't they coin? 	couldn't I be coining?
couldn't you be coining?
couldn't he be coining?
couldn't we be coining?
couldn't you be coining?
couldn't they be coining? 	couldn't I have coined?
couldn't you have coined?
couldn't he have coined?
couldn't we have coined?
couldn't you have coined?
couldn't they have coined? 	couldn't I have been coining?
couldn't you have been coining?
couldn't he have been coining?
couldn't we have been coining?
couldn't you have been coining?
couldn't they have been coining?