English verb conjugation
MUST QUAFF

Regular verb: quaff - quaffed - quaffed

Affirmation

Simple form	V-ing form
I must quaff you must quaff he must quaff we must quaff you must quaff they must quaff	I must be quaffing you must be quaffing he must be quaffing we must be quaffing you must be quaffing they must be quaffing
Perfect	V-ing perfect
I must have quaffed you must have quaffed he must have quaffed we must have quaffed you must have quaffed they must have quaffed	I must have been quaffing you must have been quaffing he must have been quaffing we must have been quaffing you must have been quaffing they must have been quaffing

Negation

Simple form	V-ing form
I must not quaff you must not quaff he must not quaff we must not quaff you must not quaff they must not quaff	I must not be quaffing you must not be quaffing he must not be quaffing we must not be quaffing you must not be quaffing they must not be quaffing
Perfect	V-ing perfect
I must not have quaffed you must not have quaffed he must not have quaffed we must not have quaffed you must not have quaffed they must not have quaffed	I must not have been quaffing you must not have been quaffing he must not have been quaffing we must not have been quaffing you must not have been quaffing they must not have been quaffing

Interrogative form

Simple form	V-ing form
must I quaff? must you quaff? must he quaff? must we quaff? must you quaff? must they quaff?	must I be quaffing? must you be quaffing? must he be quaffing? must we be quaffing? must you be quaffing? must they be quaffing?
Perfect	V-ing perfect
must I have quaffed? must you have quaffed? must he have quaffed? must we have quaffed? must you have quaffed? must they have quaffed?	must I have been quaffing? must you have been quaffing? must he have been quaffing? must we have been quaffing? must you have been quaffing? must they have been quaffing?

Interro-negative form

Simple form	V-ing form
must I not quaff? must you not quaff? must he not quaff? must we not quaff? must you not quaff? must they not quaff?	must I not be quaffing? must you not be quaffing? must he not be quaffing? must we not be quaffing? must you not be quaffing? must they not be quaffing?
Perfect	V-ing perfect
must I not have quaffed? must you not have quaffed? must he not have quaffed? must we not have quaffed? must you not have quaffed? must they not have quaffed?	must I not have been quaffing? must you not have been quaffing? must he not have been quaffing? must we not have been quaffing? must you not have been quaffing? must they not have been quaffing?