English verb conjugation
MUST GRUNT

Regular verb: grunt - grunted - grunted

Affirmation

Simple form	V-ing form
I must grunt you must grunt he must grunt we must grunt you must grunt they must grunt	I must be grunting you must be grunting he must be grunting we must be grunting you must be grunting they must be grunting
Perfect	V-ing perfect
I must have grunted you must have grunted he must have grunted we must have grunted you must have grunted they must have grunted	I must have been grunting you must have been grunting he must have been grunting we must have been grunting you must have been grunting they must have been grunting

Negation

Simple form	V-ing form
I mustn't grunt you mustn't grunt he mustn't grunt we mustn't grunt you mustn't grunt they mustn't grunt	I mustn't be grunting you mustn't be grunting he mustn't be grunting we mustn't be grunting you mustn't be grunting they mustn't be grunting
Perfect	V-ing perfect
I mustn't have grunted you mustn't have grunted he mustn't have grunted we mustn't have grunted you mustn't have grunted they mustn't have grunted	I mustn't have been grunting you mustn't have been grunting he mustn't have been grunting we mustn't have been grunting you mustn't have been grunting they mustn't have been grunting

Interrogative form

Simple form	V-ing form
must I grunt? must you grunt? must he grunt? must we grunt? must you grunt? must they grunt?	must I be grunting? must you be grunting? must he be grunting? must we be grunting? must you be grunting? must they be grunting?
Perfect	V-ing perfect
must I have grunted? must you have grunted? must he have grunted? must we have grunted? must you have grunted? must they have grunted?	must I have been grunting? must you have been grunting? must he have been grunting? must we have been grunting? must you have been grunting? must they have been grunting?

Interro-negative form

Simple form	V-ing form
mustn't I grunt? mustn't you grunt? mustn't he grunt? mustn't we grunt? mustn't you grunt? mustn't they grunt?	mustn't I be grunting? mustn't you be grunting? mustn't he be grunting? mustn't we be grunting? mustn't you be grunting? mustn't they be grunting?
Perfect	V-ing perfect
mustn't I have grunted? mustn't you have grunted? mustn't he have grunted? mustn't we have grunted? mustn't you have grunted? mustn't they have grunted?	mustn't I have been grunting? mustn't you have been grunting? mustn't he have been grunting? mustn't we have been grunting? mustn't you have been grunting? mustn't they have been grunting?