could fold
Regular verb: fold - folded- folded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?