English verb conjugation
COULD COSTUME

Regular verb: costume - costumed - costumed

Affirmation

Simple form	V-ing form
I could costume you could costume she could costume we could costume you could costume they could costume	I could be costuming you could be costuming she could be costuming we could be costuming you could be costuming they could be costuming
Perfect	V-ing perfect
I could have costumed you could have costumed she could have costumed we could have costumed you could have costumed they could have costumed	I could have been costuming you could have been costuming she could have been costuming we could have been costuming you could have been costuming they could have been costuming

Negation

Simple form	V-ing form
I couldn't costume you couldn't costume she couldn't costume we couldn't costume you couldn't costume they couldn't costume	I couldn't be costuming you couldn't be costuming she couldn't be costuming we couldn't be costuming you couldn't be costuming they couldn't be costuming
Perfect	V-ing perfect
I couldn't have costumed you couldn't have costumed she couldn't have costumed we couldn't have costumed you couldn't have costumed they couldn't have costumed	I couldn't have been costuming you couldn't have been costuming she couldn't have been costuming we couldn't have been costuming you couldn't have been costuming they couldn't have been costuming

Interrogative form

Simple form	V-ing form
could I costume? could you costume? could she costume? could we costume? could you costume? could they costume?	could I be costuming? could you be costuming? could she be costuming? could we be costuming? could you be costuming? could they be costuming?
Perfect	V-ing perfect
could I have costumed? could you have costumed? could she have costumed? could we have costumed? could you have costumed? could they have costumed?	could I have been costuming? could you have been costuming? could she have been costuming? could we have been costuming? could you have been costuming? could they have been costuming?

Interro-negative form

Simple form	V-ing form
couldn't I costume? couldn't you costume? couldn't she costume? couldn't we costume? couldn't you costume? couldn't they costume?	couldn't I be costuming? couldn't you be costuming? couldn't she be costuming? couldn't we be costuming? couldn't you be costuming? couldn't they be costuming?
Perfect	V-ing perfect
couldn't I have costumed? couldn't you have costumed? couldn't she have costumed? couldn't we have costumed? couldn't you have costumed? couldn't they have costumed?	couldn't I have been costuming? couldn't you have been costuming? couldn't she have been costuming? couldn't we have been costuming? couldn't you have been costuming? couldn't they have been costuming?