English verb conjugation
COULD RE-FORM

Regular verb: re-form - re-formed - re-formed

Affirmation

Simple form	V-ing form
I could re-form you could re-form he could re-form we could re-form you could re-form they could re-form	I could be re-forming you could be re-forming he could be re-forming we could be re-forming you could be re-forming they could be re-forming
Perfect	V-ing perfect
I could have re-formed you could have re-formed he could have re-formed we could have re-formed you could have re-formed they could have re-formed	I could have been re-forming you could have been re-forming he could have been re-forming we could have been re-forming you could have been re-forming they could have been re-forming

Negation

Simple form	V-ing form
I could not re-form you could not re-form he could not re-form we could not re-form you could not re-form they could not re-form	I could not be re-forming you could not be re-forming he could not be re-forming we could not be re-forming you could not be re-forming they could not be re-forming
Perfect	V-ing perfect
I could not have re-formed you could not have re-formed he could not have re-formed we could not have re-formed you could not have re-formed they could not have re-formed	I could not have been re-forming you could not have been re-forming he could not have been re-forming we could not have been re-forming you could not have been re-forming they could not have been re-forming

Interrogative form

Simple form	V-ing form
could I re-form? could you re-form? could he re-form? could we re-form? could you re-form? could they re-form?	could I be re-forming? could you be re-forming? could he be re-forming? could we be re-forming? could you be re-forming? could they be re-forming?
Perfect	V-ing perfect
could I have re-formed? could you have re-formed? could he have re-formed? could we have re-formed? could you have re-formed? could they have re-formed?	could I have been re-forming? could you have been re-forming? could he have been re-forming? could we have been re-forming? could you have been re-forming? could they have been re-forming?

Interro-negative form

Simple form	V-ing form
could I not re-form? could you not re-form? could he not re-form? could we not re-form? could you not re-form? could they not re-form?	could I not be re-forming? could you not be re-forming? could he not be re-forming? could we not be re-forming? could you not be re-forming? could they not be re-forming?
Perfect	V-ing perfect
could I not have re-formed? could you not have re-formed? could he not have re-formed? could we not have re-formed? could you not have re-formed? could they not have re-formed?	could I not have been re-forming? could you not have been re-forming? could he not have been re-forming? could we not have been re-forming? could you not have been re-forming? could they not have been re-forming?