could scroll
Regular verb: scroll - scrolled- scrolled

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