I can sort you can sort he can sort we can sort you can sort they can sort
V-ing form
I can be sorting you can be sorting he can be sorting we can be sorting you can be sorting they can be sorting
Perfect
I can have sorted you can have sorted he can have sorted we can have sorted you can have sorted they can have sorted
V-ing perfect
I can have been sorting you can have been sorting he can have been sorting we can have been sorting you can have been sorting they can have been sorting
Negation
Simple form
I cannot sort you cannot sort he cannot sort we cannot sort you cannot sort they cannot sort
V-ing form
I cannot be sorting you cannot be sorting he cannot be sorting we cannot be sorting you cannot be sorting they cannot be sorting
Perfect
I cannot have sorted you cannot have sorted he cannot have sorted we cannot have sorted you cannot have sorted they cannot have sorted
V-ing perfect
I cannot have been sorting you cannot have been sorting he cannot have been sorting we cannot have been sorting you cannot have been sorting they cannot have been sorting
Interrogative form
Simple form
can I sort? can you sort? can he sort? can we sort? can you sort? can they sort?
V-ing form
can I be sorting? can you be sorting? can he be sorting? can we be sorting? can you be sorting? can they be sorting?
Perfect
can I have sorted? can you have sorted? can he have sorted? can we have sorted? can you have sorted? can they have sorted?
V-ing perfect
can I have been sorting? can you have been sorting? can he have been sorting? can we have been sorting? can you have been sorting? can they have been sorting?
Interro-negative form
Simple form
can I not sort? can you not sort? can he not sort? can we not sort? can you not sort? can they not sort?
V-ing form
can I not be sorting? can you not be sorting? can he not be sorting? can we not be sorting? can you not be sorting? can they not be sorting?
Perfect
can I not have sorted? can you not have sorted? can he not have sorted? can we not have sorted? can you not have sorted? can they not have sorted?
V-ing perfect
can I not have been sorting? can you not have been sorting? can he not have been sorting? can we not have been sorting? can you not have been sorting? can they not have been sorting?