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 couldn't fishtail you couldn't fishtail she couldn't fishtail we couldn't fishtail you couldn't fishtail they couldn't fishtail	I couldn't be fishtailing you couldn't be fishtailing she couldn't be fishtailing we couldn't be fishtailing you couldn't be fishtailing they couldn't be fishtailing
Perfect	V-ing perfect
I couldn't have fishtailed you couldn't have fishtailed she couldn't have fishtailed we couldn't have fishtailed you couldn't have fishtailed they couldn't have fishtailed	I couldn't have been fishtailing you couldn't have been fishtailing she couldn't have been fishtailing we couldn't have been fishtailing you couldn't have been fishtailing they couldn't 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
couldn't I fishtail? couldn't you fishtail? couldn't she fishtail? couldn't we fishtail? couldn't you fishtail? couldn't they fishtail?	couldn't I be fishtailing? couldn't you be fishtailing? couldn't she be fishtailing? couldn't we be fishtailing? couldn't you be fishtailing? couldn't they be fishtailing?
Perfect	V-ing perfect
couldn't I have fishtailed? couldn't you have fishtailed? couldn't she have fishtailed? couldn't we have fishtailed? couldn't you have fishtailed? couldn't they have fishtailed?	couldn't I have been fishtailing? couldn't you have been fishtailing? couldn't she have been fishtailing? couldn't we have been fishtailing? couldn't you have been fishtailing? couldn't they have been fishtailing?