must overstay
Regular verb: overstay - overstayed- overstayed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must overstay
you must overstay
he must overstay
we must overstay
you must overstay
they must overstay 	I must be overstaying
you must be overstaying
he must be overstaying
we must be overstaying
you must be overstaying
they must be overstaying	I must have overstayed
you must have overstayed
he must have overstayed
we must have overstayed
you must have overstayed
they must have overstayed	I must have been overstaying
you must have been overstaying
he must have been overstaying
we must have been overstaying
you must have been overstaying
they must have been overstaying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't overstay
you mustn't overstay
he mustn't overstay
we mustn't overstay
you mustn't overstay
they mustn't overstay 	I mustn't be overstaying
you mustn't be overstaying
he mustn't be overstaying
we mustn't be overstaying
you mustn't be overstaying
they mustn't be overstaying	I mustn't have overstayed
you mustn't have overstayed
he mustn't have overstayed
we mustn't have overstayed
you mustn't have overstayed
they mustn't have overstayed	I mustn't have been overstaying
you mustn't have been overstaying
he mustn't have been overstaying
we mustn't have been overstaying
you mustn't have been overstaying
they mustn't have been overstaying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I overstay?
must you overstay?
must he overstay?
must we overstay?
must you overstay?
must they overstay? 	must I be overstaying?
must you be overstaying?
must he be overstaying?
must we be overstaying?
must you be overstaying?
must they be overstaying? 	must I have overstayed?
must you have overstayed?
must he have overstayed?
must we have overstayed?
must you have overstayed?
must they have overstayed? 	must I have been overstaying?
must you have been overstaying?
must he have been overstaying?
must we have been overstaying?
must you have been overstaying?
must they have been overstaying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I overstay?
mustn't you overstay?
mustn't he overstay?
mustn't we overstay?
mustn't you overstay?
mustn't they overstay? 	mustn't I be overstaying?
mustn't you be overstaying?
mustn't he be overstaying?
mustn't we be overstaying?
mustn't you be overstaying?
mustn't they be overstaying? 	mustn't I have overstayed?
mustn't you have overstayed?
mustn't he have overstayed?
mustn't we have overstayed?
mustn't you have overstayed?
mustn't they have overstayed? 	mustn't I have been overstaying?
mustn't you have been overstaying?
mustn't he have been overstaying?
mustn't we have been overstaying?
mustn't you have been overstaying?
mustn't they have been overstaying?