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 couldn't costume you couldn't costume he 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 he 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 he 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 he 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 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
couldn't I costume? couldn't you costume? couldn't he 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 he 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 he 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 he have been costuming? couldn't we have been costuming? couldn't you have been costuming? couldn't they have been costuming?