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 couldn't woof
you couldn't woof
she couldn't woof
we couldn't woof
you couldn't woof
they couldn't woof 	I couldn't be woofing
you couldn't be woofing
she couldn't be woofing
we couldn't be woofing
you couldn't be woofing
they couldn't be woofing	I couldn't have woofed
you couldn't have woofed
she couldn't have woofed
we couldn't have woofed
you couldn't have woofed
they couldn't have woofed	I couldn't have been woofing
you couldn't have been woofing
she couldn't have been woofing
we couldn't have been woofing
you couldn't have been woofing
they couldn't 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 	
couldn't I woof?
couldn't you woof?
couldn't she woof?
couldn't we woof?
couldn't you woof?
couldn't they woof? 	couldn't I be woofing?
couldn't you be woofing?
couldn't she be woofing?
couldn't we be woofing?
couldn't you be woofing?
couldn't they be woofing? 	couldn't I have woofed?
couldn't you have woofed?
couldn't she have woofed?
couldn't we have woofed?
couldn't you have woofed?
couldn't they have woofed? 	couldn't I have been woofing?
couldn't you have been woofing?
couldn't she have been woofing?
couldn't we have been woofing?
couldn't you have been woofing?
couldn't they have been woofing?