English verb conjugation
MUST FAFF

Regular verb: faff - faffed - faffed

Affirmation

Simple form	V-ing form
I must faff you must faff he must faff we must faff you must faff they must faff	I must be faffing you must be faffing he must be faffing we must be faffing you must be faffing they must be faffing
Perfect	V-ing perfect
I must have faffed you must have faffed he must have faffed we must have faffed you must have faffed they must have faffed	I must have been faffing you must have been faffing he must have been faffing we must have been faffing you must have been faffing they must have been faffing

Negation

Simple form	V-ing form
I mustn't faff you mustn't faff he mustn't faff we mustn't faff you mustn't faff they mustn't faff	I mustn't be faffing you mustn't be faffing he mustn't be faffing we mustn't be faffing you mustn't be faffing they mustn't be faffing
Perfect	V-ing perfect
I mustn't have faffed you mustn't have faffed he mustn't have faffed we mustn't have faffed you mustn't have faffed they mustn't have faffed	I mustn't have been faffing you mustn't have been faffing he mustn't have been faffing we mustn't have been faffing you mustn't have been faffing they mustn't have been faffing

Interrogative form

Simple form	V-ing form
must I faff? must you faff? must he faff? must we faff? must you faff? must they faff?	must I be faffing? must you be faffing? must he be faffing? must we be faffing? must you be faffing? must they be faffing?
Perfect	V-ing perfect
must I have faffed? must you have faffed? must he have faffed? must we have faffed? must you have faffed? must they have faffed?	must I have been faffing? must you have been faffing? must he have been faffing? must we have been faffing? must you have been faffing? must they have been faffing?

Interro-negative form

Simple form	V-ing form
mustn't I faff? mustn't you faff? mustn't he faff? mustn't we faff? mustn't you faff? mustn't they faff?	mustn't I be faffing? mustn't you be faffing? mustn't he be faffing? mustn't we be faffing? mustn't you be faffing? mustn't they be faffing?
Perfect	V-ing perfect
mustn't I have faffed? mustn't you have faffed? mustn't he have faffed? mustn't we have faffed? mustn't you have faffed? mustn't they have faffed?	mustn't I have been faffing? mustn't you have been faffing? mustn't he have been faffing? mustn't we have been faffing? mustn't you have been faffing? mustn't they have been faffing?