English verb conjugation
COULD RAIL

Regular verb: rail - railed - railed

Affirmation

Simple form	V-ing form
I could rail you could rail he could rail we could rail you could rail they could rail	I could be railing you could be railing he could be railing we could be railing you could be railing they could be railing
Perfect	V-ing perfect
I could have railed you could have railed he could have railed we could have railed you could have railed they could have railed	I could have been railing you could have been railing he could have been railing we could have been railing you could have been railing they could have been railing

Negation

Simple form	V-ing form
I could not rail you could not rail he could not rail we could not rail you could not rail they could not rail	I could not be railing you could not be railing he could not be railing we could not be railing you could not be railing they could not be railing
Perfect	V-ing perfect
I could not have railed you could not have railed he could not have railed we could not have railed you could not have railed they could not have railed	I could not have been railing you could not have been railing he could not have been railing we could not have been railing you could not have been railing they could not have been railing

Interrogative form

Simple form	V-ing form
could I rail? could you rail? could he rail? could we rail? could you rail? could they rail?	could I be railing? could you be railing? could he be railing? could we be railing? could you be railing? could they be railing?
Perfect	V-ing perfect
could I have railed? could you have railed? could he have railed? could we have railed? could you have railed? could they have railed?	could I have been railing? could you have been railing? could he have been railing? could we have been railing? could you have been railing? could they have been railing?

Interro-negative form

Simple form	V-ing form
could I not rail? could you not rail? could he not rail? could we not rail? could you not rail? could they not rail?	could I not be railing? could you not be railing? could he not be railing? could we not be railing? could you not be railing? could they not be railing?
Perfect	V-ing perfect
could I not have railed? could you not have railed? could he not have railed? could we not have railed? could you not have railed? could they not have railed?	could I not have been railing? could you not have been railing? could he not have been railing? could we not have been railing? could you not have been railing? could they not have been railing?