English verb conjugation
MUST TRIFFLE

Regular verb: triffle - triffled - triffled

Affirmation

Simple form	V-ing form
I must triffle you must triffle she must triffle we must triffle you must triffle they must triffle	I must be triffling you must be triffling she 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 she 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 she 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 she 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 she 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 she 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 she 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 she triffle? must we triffle? must you triffle? must they triffle?	must I be triffling? must you be triffling? must she 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 she 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 she 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 she 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 she 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 she 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 she have been triffling? mustn't we have been triffling? mustn't you have been triffling? mustn't they have been triffling?