English verb conjugation
COULD OVERREFINE

Regular verb: overrefine - overrefined - overrefined

Affirmation

Simple form	V-ing form
I could overrefine you could overrefine he could overrefine we could overrefine you could overrefine they could overrefine	I could be overrefining you could be overrefining he could be overrefining we could be overrefining you could be overrefining they could be overrefining
Perfect	V-ing perfect
I could have overrefined you could have overrefined he could have overrefined we could have overrefined you could have overrefined they could have overrefined	I could have been overrefining you could have been overrefining he could have been overrefining we could have been overrefining you could have been overrefining they could have been overrefining

Negation

Simple form	V-ing form
I couldn't overrefine you couldn't overrefine he couldn't overrefine we couldn't overrefine you couldn't overrefine they couldn't overrefine	I couldn't be overrefining you couldn't be overrefining he couldn't be overrefining we couldn't be overrefining you couldn't be overrefining they couldn't be overrefining
Perfect	V-ing perfect
I couldn't have overrefined you couldn't have overrefined he couldn't have overrefined we couldn't have overrefined you couldn't have overrefined they couldn't have overrefined	I couldn't have been overrefining you couldn't have been overrefining he couldn't have been overrefining we couldn't have been overrefining you couldn't have been overrefining they couldn't have been overrefining

Interrogative form

Simple form	V-ing form
could I overrefine? could you overrefine? could he overrefine? could we overrefine? could you overrefine? could they overrefine?	could I be overrefining? could you be overrefining? could he be overrefining? could we be overrefining? could you be overrefining? could they be overrefining?
Perfect	V-ing perfect
could I have overrefined? could you have overrefined? could he have overrefined? could we have overrefined? could you have overrefined? could they have overrefined?	could I have been overrefining? could you have been overrefining? could he have been overrefining? could we have been overrefining? could you have been overrefining? could they have been overrefining?

Interro-negative form

Simple form	V-ing form
couldn't I overrefine? couldn't you overrefine? couldn't he overrefine? couldn't we overrefine? couldn't you overrefine? couldn't they overrefine?	couldn't I be overrefining? couldn't you be overrefining? couldn't he be overrefining? couldn't we be overrefining? couldn't you be overrefining? couldn't they be overrefining?
Perfect	V-ing perfect
couldn't I have overrefined? couldn't you have overrefined? couldn't he have overrefined? couldn't we have overrefined? couldn't you have overrefined? couldn't they have overrefined?	couldn't I have been overrefining? couldn't you have been overrefining? couldn't he have been overrefining? couldn't we have been overrefining? couldn't you have been overrefining? couldn't they have been overrefining?