English verb conjugation
COULD WAIL

Regular verb: wail - wailed - wailed

Affirmation

Simple form	V-ing form
I could wail you could wail he could wail we could wail you could wail they could wail	I could be wailing you could be wailing he could be wailing we could be wailing you could be wailing they could be wailing
Perfect	V-ing perfect
I could have wailed you could have wailed he could have wailed we could have wailed you could have wailed they could have wailed	I could have been wailing you could have been wailing he could have been wailing we could have been wailing you could have been wailing they could have been wailing

Negation

Simple form	V-ing form
I couldn't wail you couldn't wail he couldn't wail we couldn't wail you couldn't wail they couldn't wail	I couldn't be wailing you couldn't be wailing he couldn't be wailing we couldn't be wailing you couldn't be wailing they couldn't be wailing
Perfect	V-ing perfect
I couldn't have wailed you couldn't have wailed he couldn't have wailed we couldn't have wailed you couldn't have wailed they couldn't have wailed	I couldn't have been wailing you couldn't have been wailing he couldn't have been wailing we couldn't have been wailing you couldn't have been wailing they couldn't have been wailing

Interrogative form

Simple form	V-ing form
could I wail? could you wail? could he wail? could we wail? could you wail? could they wail?	could I be wailing? could you be wailing? could he be wailing? could we be wailing? could you be wailing? could they be wailing?
Perfect	V-ing perfect
could I have wailed? could you have wailed? could he have wailed? could we have wailed? could you have wailed? could they have wailed?	could I have been wailing? could you have been wailing? could he have been wailing? could we have been wailing? could you have been wailing? could they have been wailing?

Interro-negative form

Simple form	V-ing form
couldn't I wail? couldn't you wail? couldn't he wail? couldn't we wail? couldn't you wail? couldn't they wail?	couldn't I be wailing? couldn't you be wailing? couldn't he be wailing? couldn't we be wailing? couldn't you be wailing? couldn't they be wailing?
Perfect	V-ing perfect
couldn't I have wailed? couldn't you have wailed? couldn't he have wailed? couldn't we have wailed? couldn't you have wailed? couldn't they have wailed?	couldn't I have been wailing? couldn't you have been wailing? couldn't he have been wailing? couldn't we have been wailing? couldn't you have been wailing? couldn't they have been wailing?