English verb conjugation
MUST WHIFFLE

Regular verb: whiffle - whiffled - whiffled

Affirmation

Simple form	V-ing form
I must whiffle you must whiffle he must whiffle we must whiffle you must whiffle they must whiffle	I must be whiffling you must be whiffling he must be whiffling we must be whiffling you must be whiffling they must be whiffling
Perfect	V-ing perfect
I must have whiffled you must have whiffled he must have whiffled we must have whiffled you must have whiffled they must have whiffled	I must have been whiffling you must have been whiffling he must have been whiffling we must have been whiffling you must have been whiffling they must have been whiffling

Negation

Simple form	V-ing form
I mustn't whiffle you mustn't whiffle he mustn't whiffle we mustn't whiffle you mustn't whiffle they mustn't whiffle	I mustn't be whiffling you mustn't be whiffling he mustn't be whiffling we mustn't be whiffling you mustn't be whiffling they mustn't be whiffling
Perfect	V-ing perfect
I mustn't have whiffled you mustn't have whiffled he mustn't have whiffled we mustn't have whiffled you mustn't have whiffled they mustn't have whiffled	I mustn't have been whiffling you mustn't have been whiffling he mustn't have been whiffling we mustn't have been whiffling you mustn't have been whiffling they mustn't have been whiffling

Interrogative form

Simple form	V-ing form
must I whiffle? must you whiffle? must he whiffle? must we whiffle? must you whiffle? must they whiffle?	must I be whiffling? must you be whiffling? must he be whiffling? must we be whiffling? must you be whiffling? must they be whiffling?
Perfect	V-ing perfect
must I have whiffled? must you have whiffled? must he have whiffled? must we have whiffled? must you have whiffled? must they have whiffled?	must I have been whiffling? must you have been whiffling? must he have been whiffling? must we have been whiffling? must you have been whiffling? must they have been whiffling?

Interro-negative form

Simple form	V-ing form
mustn't I whiffle? mustn't you whiffle? mustn't he whiffle? mustn't we whiffle? mustn't you whiffle? mustn't they whiffle?	mustn't I be whiffling? mustn't you be whiffling? mustn't he be whiffling? mustn't we be whiffling? mustn't you be whiffling? mustn't they be whiffling?
Perfect	V-ing perfect
mustn't I have whiffled? mustn't you have whiffled? mustn't he have whiffled? mustn't we have whiffled? mustn't you have whiffled? mustn't they have whiffled?	mustn't I have been whiffling? mustn't you have been whiffling? mustn't he have been whiffling? mustn't we have been whiffling? mustn't you have been whiffling? mustn't they have been whiffling?