must triffle
Regular verb: triffle - triffled- triffled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?