must stay
Regular verb: stay - stayed- stayed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?