English verb conjugation
COULD WOOF

Regular verb: woof - woofed - woofed

Affirmation

Simple form	V-ing form
I could woof you could woof he could woof we could woof you could woof they could woof	I could be woofing you could be woofing he could be woofing we could be woofing you could be woofing they could be woofing
Perfect	V-ing perfect
I could have woofed you could have woofed he could have woofed we could have woofed you could have woofed they could have woofed	I could have been woofing you could have been woofing he could have been woofing we could have been woofing you could have been woofing they could have been woofing

Negation

Simple form	V-ing form
I could not woof you could not woof he could not woof we could not woof you could not woof they could not woof	I could not be woofing you could not be woofing he could not be woofing we could not be woofing you could not be woofing they could not be woofing
Perfect	V-ing perfect
I could not have woofed you could not have woofed he could not have woofed we could not have woofed you could not have woofed they could not have woofed	I could not have been woofing you could not have been woofing he could not have been woofing we could not have been woofing you could not have been woofing they could not have been woofing

Interrogative form

Simple form	V-ing form
could I woof? could you woof? could he woof? could we woof? could you woof? could they woof?	could I be woofing? could you be woofing? could he be woofing? could we be woofing? could you be woofing? could they be woofing?
Perfect	V-ing perfect
could I have woofed? could you have woofed? could he have woofed? could we have woofed? could you have woofed? could they have woofed?	could I have been woofing? could you have been woofing? could he have been woofing? could we have been woofing? could you have been woofing? could they have been woofing?

Interro-negative form

Simple form	V-ing form
could I not woof? could you not woof? could he not woof? could we not woof? could you not woof? could they not woof?	could I not be woofing? could you not be woofing? could he not be woofing? could we not be woofing? could you not be woofing? could they not be woofing?
Perfect	V-ing perfect
could I not have woofed? could you not have woofed? could he not have woofed? could we not have woofed? could you not have woofed? could they not have woofed?	could I not have been woofing? could you not have been woofing? could he not have been woofing? could we not have been woofing? could you not have been woofing? could they not have been woofing?