could unzip
Verbo regular: unzip - unziped- unziped

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could unzip
you could unzip
he could unzip
we could unzip
you could unzip
they could unzip 	I could be unziping
you could be unziping
he could be unziping
we could be unziping
you could be unziping
they could be unziping	I could have unziped
you could have unziped
he could have unziped
we could have unziped
you could have unziped
they could have unziped	I could have been unziping
you could have been unziping
he could have been unziping
we could have been unziping
you could have been unziping
they could have been unziping	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't unzip
you couldn't unzip
he couldn't unzip
we couldn't unzip
you couldn't unzip
they couldn't unzip 	I couldn't be unziping
you couldn't be unziping
he couldn't be unziping
we couldn't be unziping
you couldn't be unziping
they couldn't be unziping	I couldn't have unziped
you couldn't have unziped
he couldn't have unziped
we couldn't have unziped
you couldn't have unziped
they couldn't have unziped	I couldn't have been unziping
you couldn't have been unziping
he couldn't have been unziping
we couldn't have been unziping
you couldn't have been unziping
they couldn't have been unziping	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I unzip?
could you unzip?
could he unzip?
could we unzip?
could you unzip?
could they unzip? 	could I be unziping?
could you be unziping?
could he be unziping?
could we be unziping?
could you be unziping?
could they be unziping? 	could I have unziped?
could you have unziped?
could he have unziped?
could we have unziped?
could you have unziped?
could they have unziped? 	could I have been unziping?
could you have been unziping?
could he have been unziping?
could we have been unziping?
could you have been unziping?
could they have been unziping? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I unzip?
couldn't you unzip?
couldn't he unzip?
couldn't we unzip?
couldn't you unzip?
couldn't they unzip? 	couldn't I be unziping?
couldn't you be unziping?
couldn't he be unziping?
couldn't we be unziping?
couldn't you be unziping?
couldn't they be unziping? 	couldn't I have unziped?
couldn't you have unziped?
couldn't he have unziped?
couldn't we have unziped?
couldn't you have unziped?
couldn't they have unziped? 	couldn't I have been unziping?
couldn't you have been unziping?
couldn't he have been unziping?
couldn't we have been unziping?
couldn't you have been unziping?
couldn't they have been unziping?