English verb conjugation
COULD FISHTAIL

Regular verb: fishtail - fishtailed - fishtailed

Affirmation

Simple form	V-ing form
I could fishtail you could fishtail she could fishtail we could fishtail you could fishtail they could fishtail	I could be fishtailing you could be fishtailing she could be fishtailing we could be fishtailing you could be fishtailing they could be fishtailing
Perfect	V-ing perfect
I could have fishtailed you could have fishtailed she could have fishtailed we could have fishtailed you could have fishtailed they could have fishtailed	I could have been fishtailing you could have been fishtailing she could have been fishtailing we could have been fishtailing you could have been fishtailing they could have been fishtailing

Negation

Simple form	V-ing form
I could not fishtail you could not fishtail she could not fishtail we could not fishtail you could not fishtail they could not fishtail	I could not be fishtailing you could not be fishtailing she could not be fishtailing we could not be fishtailing you could not be fishtailing they could not be fishtailing
Perfect	V-ing perfect
I could not have fishtailed you could not have fishtailed she could not have fishtailed we could not have fishtailed you could not have fishtailed they could not have fishtailed	I could not have been fishtailing you could not have been fishtailing she could not have been fishtailing we could not have been fishtailing you could not have been fishtailing they could not have been fishtailing

Interrogative form

Simple form	V-ing form
could I fishtail? could you fishtail? could she fishtail? could we fishtail? could you fishtail? could they fishtail?	could I be fishtailing? could you be fishtailing? could she be fishtailing? could we be fishtailing? could you be fishtailing? could they be fishtailing?
Perfect	V-ing perfect
could I have fishtailed? could you have fishtailed? could she have fishtailed? could we have fishtailed? could you have fishtailed? could they have fishtailed?	could I have been fishtailing? could you have been fishtailing? could she have been fishtailing? could we have been fishtailing? could you have been fishtailing? could they have been fishtailing?

Interro-negative form

Simple form	V-ing form
could I not fishtail? could you not fishtail? could she not fishtail? could we not fishtail? could you not fishtail? could they not fishtail?	could I not be fishtailing? could you not be fishtailing? could she not be fishtailing? could we not be fishtailing? could you not be fishtailing? could they not be fishtailing?
Perfect	V-ing perfect
could I not have fishtailed? could you not have fishtailed? could she not have fishtailed? could we not have fishtailed? could you not have fishtailed? could they not have fishtailed?	could I not have been fishtailing? could you not have been fishtailing? could she not have been fishtailing? could we not have been fishtailing? could you not have been fishtailing? could they not have been fishtailing?