must bs
Regular verb: bs - bsed- bsed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must bs
you must bs
he must bs
we must bs
you must bs
they must bs 	I must be bsing
you must be bsing
he must be bsing
we must be bsing
you must be bsing
they must be bsing	I must have bsed
you must have bsed
he must have bsed
we must have bsed
you must have bsed
they must have bsed	I must have been bsing
you must have been bsing
he must have been bsing
we must have been bsing
you must have been bsing
they must have been bsing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't bs
you mustn't bs
he mustn't bs
we mustn't bs
you mustn't bs
they mustn't bs 	I mustn't be bsing
you mustn't be bsing
he mustn't be bsing
we mustn't be bsing
you mustn't be bsing
they mustn't be bsing	I mustn't have bsed
you mustn't have bsed
he mustn't have bsed
we mustn't have bsed
you mustn't have bsed
they mustn't have bsed	I mustn't have been bsing
you mustn't have been bsing
he mustn't have been bsing
we mustn't have been bsing
you mustn't have been bsing
they mustn't have been bsing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I bs?
must you bs?
must he bs?
must we bs?
must you bs?
must they bs? 	must I be bsing?
must you be bsing?
must he be bsing?
must we be bsing?
must you be bsing?
must they be bsing? 	must I have bsed?
must you have bsed?
must he have bsed?
must we have bsed?
must you have bsed?
must they have bsed? 	must I have been bsing?
must you have been bsing?
must he have been bsing?
must we have been bsing?
must you have been bsing?
must they have been bsing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I bs?
mustn't you bs?
mustn't he bs?
mustn't we bs?
mustn't you bs?
mustn't they bs? 	mustn't I be bsing?
mustn't you be bsing?
mustn't he be bsing?
mustn't we be bsing?
mustn't you be bsing?
mustn't they be bsing? 	mustn't I have bsed?
mustn't you have bsed?
mustn't he have bsed?
mustn't we have bsed?
mustn't you have bsed?
mustn't they have bsed? 	mustn't I have been bsing?
mustn't you have been bsing?
mustn't he have been bsing?
mustn't we have been bsing?
mustn't you have been bsing?
mustn't they have been bsing?