could scroll
Regular verb: scroll - scrolled- scrolled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not scroll
you could not scroll
he could not scroll
we could not scroll
you could not scroll
they could not scroll 	I could not be scrolling
you could not be scrolling
he could not be scrolling
we could not be scrolling
you could not be scrolling
they could not be scrolling	I could not have scrolled
you could not have scrolled
he could not have scrolled
we could not have scrolled
you could not have scrolled
they could not have scrolled	I could not have been scrolling
you could not have been scrolling
he could not have been scrolling
we could not have been scrolling
you could not have been scrolling
they could not have been scrolling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not scroll?
could you not scroll?
could he not scroll?
could we not scroll?
could you not scroll?
could they not scroll? 	could I not be scrolling?
could you not be scrolling?
could he not be scrolling?
could we not be scrolling?
could you not be scrolling?
could they not be scrolling? 	could I not have scrolled?
could you not have scrolled?
could he not have scrolled?
could we not have scrolled?
could you not have scrolled?
could they not have scrolled? 	could I not have been scrolling?
could you not have been scrolling?
could he not have been scrolling?
could we not have been scrolling?
could you not have been scrolling?
could they not have been scrolling?