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