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 couldn't retail you couldn't retail he couldn't retail we couldn't retail you couldn't retail they couldn't retail	I couldn't be retailing you couldn't be retailing he couldn't be retailing we couldn't be retailing you couldn't be retailing they couldn't be retailing
Perfect	V-ing perfect
I couldn't have retailed you couldn't have retailed he couldn't have retailed we couldn't have retailed you couldn't have retailed they couldn't have retailed	I couldn't have been retailing you couldn't have been retailing he couldn't have been retailing we couldn't have been retailing you couldn't have been retailing they couldn't 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
couldn't I retail? couldn't you retail? couldn't he retail? couldn't we retail? couldn't you retail? couldn't they retail?	couldn't I be retailing? couldn't you be retailing? couldn't he be retailing? couldn't we be retailing? couldn't you be retailing? couldn't they be retailing?
Perfect	V-ing perfect
couldn't I have retailed? couldn't you have retailed? couldn't he have retailed? couldn't we have retailed? couldn't you have retailed? couldn't they have retailed?	couldn't I have been retailing? couldn't you have been retailing? couldn't he have been retailing? couldn't we have been retailing? couldn't you have been retailing? couldn't they have been retailing?