English verb conjugation
CAN WOOF

Regular verb: woof - woofed - woofed

Affirmation

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

Negation

Simple form	V-ing form
I can't woof you can't woof he can't woof we can't woof you can't woof they can't woof	I can't be woofing you can't be woofing he can't be woofing we can't be woofing you can't be woofing they can't be woofing
Perfect	V-ing perfect
I can't have woofed you can't have woofed he can't have woofed we can't have woofed you can't have woofed they can't have woofed	I can't have been woofing you can't have been woofing he can't have been woofing we can't have been woofing you can't have been woofing they can't have been woofing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I woof? can't you woof? can't he woof? can't we woof? can't you woof? can't they woof?	can't I be woofing? can't you be woofing? can't he be woofing? can't we be woofing? can't you be woofing? can't they be woofing?
Perfect	V-ing perfect
can't I have woofed? can't you have woofed? can't he have woofed? can't we have woofed? can't you have woofed? can't they have woofed?	can't I have been woofing? can't you have been woofing? can't he have been woofing? can't we have been woofing? can't you have been woofing? can't they have been woofing?