English verb conjugation
MUST TRIFFLE

Regular verb: triffle - triffled - triffled

Affirmation

Simple form	V-ing form
I must triffle you must triffle he must triffle we must triffle you must triffle they must triffle	I must be triffling you must be triffling he must be triffling we must be triffling you must be triffling they must be triffling
Perfect	V-ing perfect
I must have triffled you must have triffled he must have triffled we must have triffled you must have triffled they must have triffled	I must have been triffling you must have been triffling he must have been triffling we must have been triffling you must have been triffling they must have been triffling

Negation

Simple form	V-ing form
I mustn't triffle you mustn't triffle he mustn't triffle we mustn't triffle you mustn't triffle they mustn't triffle	I mustn't be triffling you mustn't be triffling he mustn't be triffling we mustn't be triffling you mustn't be triffling they mustn't be triffling
Perfect	V-ing perfect
I mustn't have triffled you mustn't have triffled he mustn't have triffled we mustn't have triffled you mustn't have triffled they mustn't have triffled	I mustn't have been triffling you mustn't have been triffling he mustn't have been triffling we mustn't have been triffling you mustn't have been triffling they mustn't have been triffling

Interrogative form

Simple form	V-ing form
must I triffle? must you triffle? must he triffle? must we triffle? must you triffle? must they triffle?	must I be triffling? must you be triffling? must he be triffling? must we be triffling? must you be triffling? must they be triffling?
Perfect	V-ing perfect
must I have triffled? must you have triffled? must he have triffled? must we have triffled? must you have triffled? must they have triffled?	must I have been triffling? must you have been triffling? must he have been triffling? must we have been triffling? must you have been triffling? must they have been triffling?

Interro-negative form

Simple form	V-ing form
mustn't I triffle? mustn't you triffle? mustn't he triffle? mustn't we triffle? mustn't you triffle? mustn't they triffle?	mustn't I be triffling? mustn't you be triffling? mustn't he be triffling? mustn't we be triffling? mustn't you be triffling? mustn't they be triffling?
Perfect	V-ing perfect
mustn't I have triffled? mustn't you have triffled? mustn't he have triffled? mustn't we have triffled? mustn't you have triffled? mustn't they have triffled?	mustn't I have been triffling? mustn't you have been triffling? mustn't he have been triffling? mustn't we have been triffling? mustn't you have been triffling? mustn't they have been triffling?