English verb conjugation
MUST CHAFF

Regular verb: chaff - chaffed - chaffed

Affirmation

Simple form	V-ing form
I must chaff you must chaff he must chaff we must chaff you must chaff they must chaff	I must be chaffing you must be chaffing he must be chaffing we must be chaffing you must be chaffing they must be chaffing
Perfect	V-ing perfect
I must have chaffed you must have chaffed he must have chaffed we must have chaffed you must have chaffed they must have chaffed	I must have been chaffing you must have been chaffing he must have been chaffing we must have been chaffing you must have been chaffing they must have been chaffing

Negation

Simple form	V-ing form
I mustn't chaff you mustn't chaff he mustn't chaff we mustn't chaff you mustn't chaff they mustn't chaff	I mustn't be chaffing you mustn't be chaffing he mustn't be chaffing we mustn't be chaffing you mustn't be chaffing they mustn't be chaffing
Perfect	V-ing perfect
I mustn't have chaffed you mustn't have chaffed he mustn't have chaffed we mustn't have chaffed you mustn't have chaffed they mustn't have chaffed	I mustn't have been chaffing you mustn't have been chaffing he mustn't have been chaffing we mustn't have been chaffing you mustn't have been chaffing they mustn't have been chaffing

Interrogative form

Simple form	V-ing form
must I chaff? must you chaff? must he chaff? must we chaff? must you chaff? must they chaff?	must I be chaffing? must you be chaffing? must he be chaffing? must we be chaffing? must you be chaffing? must they be chaffing?
Perfect	V-ing perfect
must I have chaffed? must you have chaffed? must he have chaffed? must we have chaffed? must you have chaffed? must they have chaffed?	must I have been chaffing? must you have been chaffing? must he have been chaffing? must we have been chaffing? must you have been chaffing? must they have been chaffing?

Interro-negative form

Simple form	V-ing form
mustn't I chaff? mustn't you chaff? mustn't he chaff? mustn't we chaff? mustn't you chaff? mustn't they chaff?	mustn't I be chaffing? mustn't you be chaffing? mustn't he be chaffing? mustn't we be chaffing? mustn't you be chaffing? mustn't they be chaffing?
Perfect	V-ing perfect
mustn't I have chaffed? mustn't you have chaffed? mustn't he have chaffed? mustn't we have chaffed? mustn't you have chaffed? mustn't they have chaffed?	mustn't I have been chaffing? mustn't you have been chaffing? mustn't he have been chaffing? mustn't we have been chaffing? mustn't you have been chaffing? mustn't they have been chaffing?