could woof
Regular verb: woof - woofed- woofed

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