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 must not bs you must not bs he must not bs we must not bs you must not bs they must not bs	I must not be bsing you must not be bsing he must not be bsing we must not be bsing you must not be bsing they must not be bsing
Perfect	V-ing perfect
I must not have bsed you must not have bsed he must not have bsed we must not have bsed you must not have bsed they must not have bsed	I must not have been bsing you must not have been bsing he must not have been bsing we must not have been bsing you must not have been bsing they must not 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
must I not bs? must you not bs? must he not bs? must we not bs? must you not bs? must they not bs?	must I not be bsing? must you not be bsing? must he not be bsing? must we not be bsing? must you not be bsing? must they not be bsing?
Perfect	V-ing perfect
must I not have bsed? must you not have bsed? must he not have bsed? must we not have bsed? must you not have bsed? must they not have bsed?	must I not have been bsing? must you not have been bsing? must he not have been bsing? must we not have been bsing? must you not have been bsing? must they not have been bsing?