English verb conjugation
COULD FISHTAIL

Regular verb: fishtail - fishtailed - fishtailed

Affirmation

Simple form	V-ing form
I could fishtail you could fishtail he could fishtail we could fishtail you could fishtail they could fishtail	I could be fishtailing you could be fishtailing he 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 he 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 he 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 he 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 he 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 he 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 he 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 he fishtail? could we fishtail? could you fishtail? could they fishtail?	could I be fishtailing? could you be fishtailing? could he 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 he 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 he 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 he 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 he 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 he 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 he have been fishtailing? couldn't we have been fishtailing? couldn't you have been fishtailing? couldn't they have been fishtailing?