English verb conjugation
MUST GUM

Regular verb: gum - gummed - gummed

Affirmation

Simple form	V-ing form
I must gum you must gum he must gum we must gum you must gum they must gum	I must be gumming you must be gumming he must be gumming we must be gumming you must be gumming they must be gumming
Perfect	V-ing perfect
I must have gummed you must have gummed he must have gummed we must have gummed you must have gummed they must have gummed	I must have been gumming you must have been gumming he must have been gumming we must have been gumming you must have been gumming they must have been gumming

Negation

Simple form	V-ing form
I must not gum you must not gum he must not gum we must not gum you must not gum they must not gum	I must not be gumming you must not be gumming he must not be gumming we must not be gumming you must not be gumming they must not be gumming
Perfect	V-ing perfect
I must not have gummed you must not have gummed he must not have gummed we must not have gummed you must not have gummed they must not have gummed	I must not have been gumming you must not have been gumming he must not have been gumming we must not have been gumming you must not have been gumming they must not have been gumming

Interrogative form

Simple form	V-ing form
must I gum? must you gum? must he gum? must we gum? must you gum? must they gum?	must I be gumming? must you be gumming? must he be gumming? must we be gumming? must you be gumming? must they be gumming?
Perfect	V-ing perfect
must I have gummed? must you have gummed? must he have gummed? must we have gummed? must you have gummed? must they have gummed?	must I have been gumming? must you have been gumming? must he have been gumming? must we have been gumming? must you have been gumming? must they have been gumming?

Interro-negative form

Simple form	V-ing form
must I not gum? must you not gum? must he not gum? must we not gum? must you not gum? must they not gum?	must I not be gumming? must you not be gumming? must he not be gumming? must we not be gumming? must you not be gumming? must they not be gumming?
Perfect	V-ing perfect
must I not have gummed? must you not have gummed? must he not have gummed? must we not have gummed? must you not have gummed? must they not have gummed?	must I not have been gumming? must you not have been gumming? must he not have been gumming? must we not have been gumming? must you not have been gumming? must they not have been gumming?