English verb conjugation
COULD FOLD

Regular verb: fold - folded - folded

Affirmation

Simple form	V-ing form
I could fold you could fold she could fold we could fold you could fold they could fold	I could be folding you could be folding she could be folding we could be folding you could be folding they could be folding
Perfect	V-ing perfect
I could have folded you could have folded she could have folded we could have folded you could have folded they could have folded	I could have been folding you could have been folding she could have been folding we could have been folding you could have been folding they could have been folding

Negation

Simple form	V-ing form
I couldn't fold you couldn't fold she couldn't fold we couldn't fold you couldn't fold they couldn't fold	I couldn't be folding you couldn't be folding she couldn't be folding we couldn't be folding you couldn't be folding they couldn't be folding
Perfect	V-ing perfect
I couldn't have folded you couldn't have folded she couldn't have folded we couldn't have folded you couldn't have folded they couldn't have folded	I couldn't have been folding you couldn't have been folding she couldn't have been folding we couldn't have been folding you couldn't have been folding they couldn't have been folding

Interrogative form

Simple form	V-ing form
could I fold? could you fold? could she fold? could we fold? could you fold? could they fold?	could I be folding? could you be folding? could she be folding? could we be folding? could you be folding? could they be folding?
Perfect	V-ing perfect
could I have folded? could you have folded? could she have folded? could we have folded? could you have folded? could they have folded?	could I have been folding? could you have been folding? could she have been folding? could we have been folding? could you have been folding? could they have been folding?

Interro-negative form

Simple form	V-ing form
couldn't I fold? couldn't you fold? couldn't she fold? couldn't we fold? couldn't you fold? couldn't they fold?	couldn't I be folding? couldn't you be folding? couldn't she be folding? couldn't we be folding? couldn't you be folding? couldn't they be folding?
Perfect	V-ing perfect
couldn't I have folded? couldn't you have folded? couldn't she have folded? couldn't we have folded? couldn't you have folded? couldn't they have folded?	couldn't I have been folding? couldn't you have been folding? couldn't she have been folding? couldn't we have been folding? couldn't you have been folding? couldn't they have been folding?