English verb conjugation
COULD RETAIL

Regular verb: retail - retailed - retailed

Affirmation

Simple form	V-ing form
I could retail you could retail she could retail we could retail you could retail they could retail	I could be retailing you could be retailing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she retail? could we retail? could you retail? could they retail?	could I be retailing? could you be retailing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been retailing? couldn't we have been retailing? couldn't you have been retailing? couldn't they have been retailing?