English verb conjugation
COULD RETAIL

Regular verb: retail - retailed - retailed

Affirmation

Simple form	V-ing form
I could retail you could retail he could retail we could retail you could retail they could retail	I could be retailing you could be retailing he could be retailing we could be retailing you could be retailing they could be retailing
Perfect	V-ing perfect
I could have retailed you could have retailed he could have retailed we could have retailed you could have retailed they could have retailed	I could have been retailing you could have been retailing he could have been retailing we could have been retailing you could have been retailing they could have been retailing

Negation

Simple form	V-ing form
I could not retail you could not retail he could not retail we could not retail you could not retail they could not retail	I could not be retailing you could not be retailing he could not be retailing we could not be retailing you could not be retailing they could not be retailing
Perfect	V-ing perfect
I could not have retailed you could not have retailed he could not have retailed we could not have retailed you could not have retailed they could not have retailed	I could not have been retailing you could not have been retailing he could not have been retailing we could not have been retailing you could not have been retailing they could not have been retailing

Interrogative form

Simple form	V-ing form
could I retail? could you retail? could he retail? could we retail? could you retail? could they retail?	could I be retailing? could you be retailing? could he be retailing? could we be retailing? could you be retailing? could they be retailing?
Perfect	V-ing perfect
could I have retailed? could you have retailed? could he have retailed? could we have retailed? could you have retailed? could they have retailed?	could I have been retailing? could you have been retailing? could he have been retailing? could we have been retailing? could you have been retailing? could they have been retailing?

Interro-negative form

Simple form	V-ing form
could I not retail? could you not retail? could he not retail? could we not retail? could you not retail? could they not retail?	could I not be retailing? could you not be retailing? could he not be retailing? could we not be retailing? could you not be retailing? could they not be retailing?
Perfect	V-ing perfect
could I not have retailed? could you not have retailed? could he not have retailed? could we not have retailed? could you not have retailed? could they not have retailed?	could I not have been retailing? could you not have been retailing? could he not have been retailing? could we not have been retailing? could you not have been retailing? could they not have been retailing?