English verb conjugation
COULD COIN

Regular verb: coin - coined - coined

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?