English verb conjugation
MUST STAY

Regular verb: stay - stayed - stayed

Affirmation

Simple form	V-ing form
I must stay you must stay she must stay we must stay you must stay they must stay	I must be staying you must be staying she must be staying we must be staying you must be staying they must be staying
Perfect	V-ing perfect
I must have stayed you must have stayed she must have stayed we must have stayed you must have stayed they must have stayed	I must have been staying you must have been staying she must have been staying we must have been staying you must have been staying they must have been staying

Negation

Simple form	V-ing form
I mustn't stay you mustn't stay she mustn't stay we mustn't stay you mustn't stay they mustn't stay	I mustn't be staying you mustn't be staying she mustn't be staying we mustn't be staying you mustn't be staying they mustn't be staying
Perfect	V-ing perfect
I mustn't have stayed you mustn't have stayed she mustn't have stayed we mustn't have stayed you mustn't have stayed they mustn't have stayed	I mustn't have been staying you mustn't have been staying she mustn't have been staying we mustn't have been staying you mustn't have been staying they mustn't have been staying

Interrogative form

Simple form	V-ing form
must I stay? must you stay? must she stay? must we stay? must you stay? must they stay?	must I be staying? must you be staying? must she be staying? must we be staying? must you be staying? must they be staying?
Perfect	V-ing perfect
must I have stayed? must you have stayed? must she have stayed? must we have stayed? must you have stayed? must they have stayed?	must I have been staying? must you have been staying? must she have been staying? must we have been staying? must you have been staying? must they have been staying?

Interro-negative form

Simple form	V-ing form
mustn't I stay? mustn't you stay? mustn't she stay? mustn't we stay? mustn't you stay? mustn't they stay?	mustn't I be staying? mustn't you be staying? mustn't she be staying? mustn't we be staying? mustn't you be staying? mustn't they be staying?
Perfect	V-ing perfect
mustn't I have stayed? mustn't you have stayed? mustn't she have stayed? mustn't we have stayed? mustn't you have stayed? mustn't they have stayed?	mustn't I have been staying? mustn't you have been staying? mustn't she have been staying? mustn't we have been staying? mustn't you have been staying? mustn't they have been staying?