English verb conjugation
COULD SORT

Regular verb: sort - sorted - sorted

Affirmation

Simple form	V-ing form
I could sort you could sort he could sort we could sort you could sort they could sort	I could be sorting you could be sorting he could be sorting we could be sorting you could be sorting they could be sorting
Perfect	V-ing perfect
I could have sorted you could have sorted he could have sorted we could have sorted you could have sorted they could have sorted	I could have been sorting you could have been sorting he could have been sorting we could have been sorting you could have been sorting they could have been sorting

Negation

Simple form	V-ing form
I couldn't sort you couldn't sort he couldn't sort we couldn't sort you couldn't sort they couldn't sort	I couldn't be sorting you couldn't be sorting he couldn't be sorting we couldn't be sorting you couldn't be sorting they couldn't be sorting
Perfect	V-ing perfect
I couldn't have sorted you couldn't have sorted he couldn't have sorted we couldn't have sorted you couldn't have sorted they couldn't have sorted	I couldn't have been sorting you couldn't have been sorting he couldn't have been sorting we couldn't have been sorting you couldn't have been sorting they couldn't have been sorting

Interrogative form

Simple form	V-ing form
could I sort? could you sort? could he sort? could we sort? could you sort? could they sort?	could I be sorting? could you be sorting? could he be sorting? could we be sorting? could you be sorting? could they be sorting?
Perfect	V-ing perfect
could I have sorted? could you have sorted? could he have sorted? could we have sorted? could you have sorted? could they have sorted?	could I have been sorting? could you have been sorting? could he have been sorting? could we have been sorting? could you have been sorting? could they have been sorting?

Interro-negative form

Simple form	V-ing form
couldn't I sort? couldn't you sort? couldn't he sort? couldn't we sort? couldn't you sort? couldn't they sort?	couldn't I be sorting? couldn't you be sorting? couldn't he be sorting? couldn't we be sorting? couldn't you be sorting? couldn't they be sorting?
Perfect	V-ing perfect
couldn't I have sorted? couldn't you have sorted? couldn't he have sorted? couldn't we have sorted? couldn't you have sorted? couldn't they have sorted?	couldn't I have been sorting? couldn't you have been sorting? couldn't he have been sorting? couldn't we have been sorting? couldn't you have been sorting? couldn't they have been sorting?