could zipper
Verbo regular: zipper - zippered- zippered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could zipper
you could zipper
he could zipper
we could zipper
you could zipper
they could zipper 	I could be zippering
you could be zippering
he could be zippering
we could be zippering
you could be zippering
they could be zippering	I could have zippered
you could have zippered
he could have zippered
we could have zippered
you could have zippered
they could have zippered	I could have been zippering
you could have been zippering
he could have been zippering
we could have been zippering
you could have been zippering
they could have been zippering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't zipper
you couldn't zipper
he couldn't zipper
we couldn't zipper
you couldn't zipper
they couldn't zipper 	I couldn't be zippering
you couldn't be zippering
he couldn't be zippering
we couldn't be zippering
you couldn't be zippering
they couldn't be zippering	I couldn't have zippered
you couldn't have zippered
he couldn't have zippered
we couldn't have zippered
you couldn't have zippered
they couldn't have zippered	I couldn't have been zippering
you couldn't have been zippering
he couldn't have been zippering
we couldn't have been zippering
you couldn't have been zippering
they couldn't have been zippering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I zipper?
could you zipper?
could he zipper?
could we zipper?
could you zipper?
could they zipper? 	could I be zippering?
could you be zippering?
could he be zippering?
could we be zippering?
could you be zippering?
could they be zippering? 	could I have zippered?
could you have zippered?
could he have zippered?
could we have zippered?
could you have zippered?
could they have zippered? 	could I have been zippering?
could you have been zippering?
could he have been zippering?
could we have been zippering?
could you have been zippering?
could they have been zippering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I zipper?
couldn't you zipper?
couldn't he zipper?
couldn't we zipper?
couldn't you zipper?
couldn't they zipper? 	couldn't I be zippering?
couldn't you be zippering?
couldn't he be zippering?
couldn't we be zippering?
couldn't you be zippering?
couldn't they be zippering? 	couldn't I have zippered?
couldn't you have zippered?
couldn't he have zippered?
couldn't we have zippered?
couldn't you have zippered?
couldn't they have zippered? 	couldn't I have been zippering?
couldn't you have been zippering?
couldn't he have been zippering?
couldn't we have been zippering?
couldn't you have been zippering?
couldn't they have been zippering?