English verb conjugation
MUST WHIFF

Regular verb: whiff - whiffed - whiffed

Affirmation

Simple form	V-ing form
I must whiff you must whiff he must whiff we must whiff you must whiff they must whiff	I must be whiffing you must be whiffing he must be whiffing we must be whiffing you must be whiffing they must be whiffing
Perfect	V-ing perfect
I must have whiffed you must have whiffed he must have whiffed we must have whiffed you must have whiffed they must have whiffed	I must have been whiffing you must have been whiffing he must have been whiffing we must have been whiffing you must have been whiffing they must have been whiffing

Negation

Simple form	V-ing form
I mustn't whiff you mustn't whiff he mustn't whiff we mustn't whiff you mustn't whiff they mustn't whiff	I mustn't be whiffing you mustn't be whiffing he mustn't be whiffing we mustn't be whiffing you mustn't be whiffing they mustn't be whiffing
Perfect	V-ing perfect
I mustn't have whiffed you mustn't have whiffed he mustn't have whiffed we mustn't have whiffed you mustn't have whiffed they mustn't have whiffed	I mustn't have been whiffing you mustn't have been whiffing he mustn't have been whiffing we mustn't have been whiffing you mustn't have been whiffing they mustn't have been whiffing

Interrogative form

Simple form	V-ing form
must I whiff? must you whiff? must he whiff? must we whiff? must you whiff? must they whiff?	must I be whiffing? must you be whiffing? must he be whiffing? must we be whiffing? must you be whiffing? must they be whiffing?
Perfect	V-ing perfect
must I have whiffed? must you have whiffed? must he have whiffed? must we have whiffed? must you have whiffed? must they have whiffed?	must I have been whiffing? must you have been whiffing? must he have been whiffing? must we have been whiffing? must you have been whiffing? must they have been whiffing?

Interro-negative form

Simple form	V-ing form
mustn't I whiff? mustn't you whiff? mustn't he whiff? mustn't we whiff? mustn't you whiff? mustn't they whiff?	mustn't I be whiffing? mustn't you be whiffing? mustn't he be whiffing? mustn't we be whiffing? mustn't you be whiffing? mustn't they be whiffing?
Perfect	V-ing perfect
mustn't I have whiffed? mustn't you have whiffed? mustn't he have whiffed? mustn't we have whiffed? mustn't you have whiffed? mustn't they have whiffed?	mustn't I have been whiffing? mustn't you have been whiffing? mustn't he have been whiffing? mustn't we have been whiffing? mustn't you have been whiffing? mustn't they have been whiffing?