English verb conjugation
COULD QUAIL

Regular verb: quail - quailed - quailed

Affirmation

Simple form	V-ing form
I could quail you could quail he could quail we could quail you could quail they could quail	I could be quailing you could be quailing he could be quailing we could be quailing you could be quailing they could be quailing
Perfect	V-ing perfect
I could have quailed you could have quailed he could have quailed we could have quailed you could have quailed they could have quailed	I could have been quailing you could have been quailing he could have been quailing we could have been quailing you could have been quailing they could have been quailing

Negation

Simple form	V-ing form
I couldn't quail you couldn't quail he couldn't quail we couldn't quail you couldn't quail they couldn't quail	I couldn't be quailing you couldn't be quailing he couldn't be quailing we couldn't be quailing you couldn't be quailing they couldn't be quailing
Perfect	V-ing perfect
I couldn't have quailed you couldn't have quailed he couldn't have quailed we couldn't have quailed you couldn't have quailed they couldn't have quailed	I couldn't have been quailing you couldn't have been quailing he couldn't have been quailing we couldn't have been quailing you couldn't have been quailing they couldn't have been quailing

Interrogative form

Simple form	V-ing form
could I quail? could you quail? could he quail? could we quail? could you quail? could they quail?	could I be quailing? could you be quailing? could he be quailing? could we be quailing? could you be quailing? could they be quailing?
Perfect	V-ing perfect
could I have quailed? could you have quailed? could he have quailed? could we have quailed? could you have quailed? could they have quailed?	could I have been quailing? could you have been quailing? could he have been quailing? could we have been quailing? could you have been quailing? could they have been quailing?

Interro-negative form

Simple form	V-ing form
couldn't I quail? couldn't you quail? couldn't he quail? couldn't we quail? couldn't you quail? couldn't they quail?	couldn't I be quailing? couldn't you be quailing? couldn't he be quailing? couldn't we be quailing? couldn't you be quailing? couldn't they be quailing?
Perfect	V-ing perfect
couldn't I have quailed? couldn't you have quailed? couldn't he have quailed? couldn't we have quailed? couldn't you have quailed? couldn't they have quailed?	couldn't I have been quailing? couldn't you have been quailing? couldn't he have been quailing? couldn't we have been quailing? couldn't you have been quailing? couldn't they have been quailing?