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 mustn't gum you mustn't gum he mustn't gum we mustn't gum you mustn't gum they mustn't gum	I mustn't be gumming you mustn't be gumming he mustn't be gumming we mustn't be gumming you mustn't be gumming they mustn't be gumming
Perfect	V-ing perfect
I mustn't have gummed you mustn't have gummed he mustn't have gummed we mustn't have gummed you mustn't have gummed they mustn't have gummed	I mustn't have been gumming you mustn't have been gumming he mustn't have been gumming we mustn't have been gumming you mustn't have been gumming they mustn't 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
mustn't I gum? mustn't you gum? mustn't he gum? mustn't we gum? mustn't you gum? mustn't they gum?	mustn't I be gumming? mustn't you be gumming? mustn't he be gumming? mustn't we be gumming? mustn't you be gumming? mustn't they be gumming?
Perfect	V-ing perfect
mustn't I have gummed? mustn't you have gummed? mustn't he have gummed? mustn't we have gummed? mustn't you have gummed? mustn't they have gummed?	mustn't I have been gumming? mustn't you have been gumming? mustn't he have been gumming? mustn't we have been gumming? mustn't you have been gumming? mustn't they have been gumming?