could scroll
Verbo regular: scroll - scrolled- scrolled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could scroll
you could scroll
he could scroll
we could scroll
you could scroll
they could scroll 	I could be scrolling
you could be scrolling
he could be scrolling
we could be scrolling
you could be scrolling
they could be scrolling	I could have scrolled
you could have scrolled
he could have scrolled
we could have scrolled
you could have scrolled
they could have scrolled	I could have been scrolling
you could have been scrolling
he could have been scrolling
we could have been scrolling
you could have been scrolling
they could have been scrolling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't scroll
you couldn't scroll
he couldn't scroll
we couldn't scroll
you couldn't scroll
they couldn't scroll 	I couldn't be scrolling
you couldn't be scrolling
he couldn't be scrolling
we couldn't be scrolling
you couldn't be scrolling
they couldn't be scrolling	I couldn't have scrolled
you couldn't have scrolled
he couldn't have scrolled
we couldn't have scrolled
you couldn't have scrolled
they couldn't have scrolled	I couldn't have been scrolling
you couldn't have been scrolling
he couldn't have been scrolling
we couldn't have been scrolling
you couldn't have been scrolling
they couldn't have been scrolling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I scroll?
could you scroll?
could he scroll?
could we scroll?
could you scroll?
could they scroll? 	could I be scrolling?
could you be scrolling?
could he be scrolling?
could we be scrolling?
could you be scrolling?
could they be scrolling? 	could I have scrolled?
could you have scrolled?
could he have scrolled?
could we have scrolled?
could you have scrolled?
could they have scrolled? 	could I have been scrolling?
could you have been scrolling?
could he have been scrolling?
could we have been scrolling?
could you have been scrolling?
could they have been scrolling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I scroll?
couldn't you scroll?
couldn't he scroll?
couldn't we scroll?
couldn't you scroll?
couldn't they scroll? 	couldn't I be scrolling?
couldn't you be scrolling?
couldn't he be scrolling?
couldn't we be scrolling?
couldn't you be scrolling?
couldn't they be scrolling? 	couldn't I have scrolled?
couldn't you have scrolled?
couldn't he have scrolled?
couldn't we have scrolled?
couldn't you have scrolled?
couldn't they have scrolled? 	couldn't I have been scrolling?
couldn't you have been scrolling?
couldn't he have been scrolling?
couldn't we have been scrolling?
couldn't you have been scrolling?
couldn't they have been scrolling?