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 could not quail you could not quail he could not quail we could not quail you could not quail they could not quail	I could not be quailing you could not be quailing he could not be quailing we could not be quailing you could not be quailing they could not be quailing
Perfect	V-ing perfect
I could not have quailed you could not have quailed he could not have quailed we could not have quailed you could not have quailed they could not have quailed	I could not have been quailing you could not have been quailing he could not have been quailing we could not have been quailing you could not have been quailing they could not 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
could I not quail? could you not quail? could he not quail? could we not quail? could you not quail? could they not quail?	could I not be quailing? could you not be quailing? could he not be quailing? could we not be quailing? could you not be quailing? could they not be quailing?
Perfect	V-ing perfect
could I not have quailed? could you not have quailed? could he not have quailed? could we not have quailed? could you not have quailed? could they not have quailed?	could I not have been quailing? could you not have been quailing? could he not have been quailing? could we not have been quailing? could you not have been quailing? could they not have been quailing?