English verb conjugation
MUST BS

Regular verb: bs - bsed - bsed

Affirmation

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