English verb conjugation
MUST COSTUME

Regular verb: costume - costumed - costumed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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