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 must not whiffle you must not whiffle he must not whiffle we must not whiffle you must not whiffle they must not whiffle	I must not be whiffling you must not be whiffling he must not be whiffling we must not be whiffling you must not be whiffling they must not be whiffling
Perfect	V-ing perfect
I must not have whiffled you must not have whiffled he must not have whiffled we must not have whiffled you must not have whiffled they must not have whiffled	I must not have been whiffling you must not have been whiffling he must not have been whiffling we must not have been whiffling you must not have been whiffling they must not 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
must I not whiffle? must you not whiffle? must he not whiffle? must we not whiffle? must you not whiffle? must they not whiffle?	must I not be whiffling? must you not be whiffling? must he not be whiffling? must we not be whiffling? must you not be whiffling? must they not be whiffling?
Perfect	V-ing perfect
must I not have whiffled? must you not have whiffled? must he not have whiffled? must we not have whiffled? must you not have whiffled? must they not have whiffled?	must I not have been whiffling? must you not have been whiffling? must he not have been whiffling? must we not have been whiffling? must you not have been whiffling? must they not have been whiffling?