English verb conjugation
MUST GRIFT

Regular verb: grift - grifted - grifted

Affirmation

Simple form	V-ing form
I must grift you must grift he must grift we must grift you must grift they must grift	I must be grifting you must be grifting he must be grifting we must be grifting you must be grifting they must be grifting
Perfect	V-ing perfect
I must have grifted you must have grifted he must have grifted we must have grifted you must have grifted they must have grifted	I must have been grifting you must have been grifting he must have been grifting we must have been grifting you must have been grifting they must have been grifting

Negation

Simple form	V-ing form
I mustn't grift you mustn't grift he mustn't grift we mustn't grift you mustn't grift they mustn't grift	I mustn't be grifting you mustn't be grifting he mustn't be grifting we mustn't be grifting you mustn't be grifting they mustn't be grifting
Perfect	V-ing perfect
I mustn't have grifted you mustn't have grifted he mustn't have grifted we mustn't have grifted you mustn't have grifted they mustn't have grifted	I mustn't have been grifting you mustn't have been grifting he mustn't have been grifting we mustn't have been grifting you mustn't have been grifting they mustn't have been grifting

Interrogative form

Simple form	V-ing form
must I grift? must you grift? must he grift? must we grift? must you grift? must they grift?	must I be grifting? must you be grifting? must he be grifting? must we be grifting? must you be grifting? must they be grifting?
Perfect	V-ing perfect
must I have grifted? must you have grifted? must he have grifted? must we have grifted? must you have grifted? must they have grifted?	must I have been grifting? must you have been grifting? must he have been grifting? must we have been grifting? must you have been grifting? must they have been grifting?

Interro-negative form

Simple form	V-ing form
mustn't I grift? mustn't you grift? mustn't he grift? mustn't we grift? mustn't you grift? mustn't they grift?	mustn't I be grifting? mustn't you be grifting? mustn't he be grifting? mustn't we be grifting? mustn't you be grifting? mustn't they be grifting?
Perfect	V-ing perfect
mustn't I have grifted? mustn't you have grifted? mustn't he have grifted? mustn't we have grifted? mustn't you have grifted? mustn't they have grifted?	mustn't I have been grifting? mustn't you have been grifting? mustn't he have been grifting? mustn't we have been grifting? mustn't you have been grifting? mustn't they have been grifting?