English verb conjugation
COULD COSTUME

Regular verb: costume - costumed - costumed

Affirmation

Simple form	V-ing form
I could costume you could costume he could costume we could costume you could costume they could costume	I could be costuming you could be costuming he 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 he 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 he 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 could not costume you could not costume he could not costume we could not costume you could not costume they could not costume	I could not be costuming you could not be costuming he could not be costuming we could not be costuming you could not be costuming they could not be costuming
Perfect	V-ing perfect
I could not have costumed you could not have costumed he could not have costumed we could not have costumed you could not have costumed they could not have costumed	I could not have been costuming you could not have been costuming he could not have been costuming we could not have been costuming you could not have been costuming they could not have been costuming

Interrogative form

Simple form	V-ing form
could I costume? could you costume? could he costume? could we costume? could you costume? could they costume?	could I be costuming? could you be costuming? could he 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 he 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 he 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
could I not costume? could you not costume? could he not costume? could we not costume? could you not costume? could they not costume?	could I not be costuming? could you not be costuming? could he not be costuming? could we not be costuming? could you not be costuming? could they not be costuming?
Perfect	V-ing perfect
could I not have costumed? could you not have costumed? could he not have costumed? could we not have costumed? could you not have costumed? could they not have costumed?	could I not have been costuming? could you not have been costuming? could he not have been costuming? could we not have been costuming? could you not have been costuming? could they not have been costuming?