must bum
Verbo regular: bum - bummed- bummed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must bum
you must bum
he must bum
we must bum
you must bum
they must bum 	I must be bumming
you must be bumming
he must be bumming
we must be bumming
you must be bumming
they must be bumming	I must have bummed
you must have bummed
he must have bummed
we must have bummed
you must have bummed
they must have bummed	I must have been bumming
you must have been bumming
he must have been bumming
we must have been bumming
you must have been bumming
they must have been bumming	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't bum
you mustn't bum
he mustn't bum
we mustn't bum
you mustn't bum
they mustn't bum 	I mustn't be bumming
you mustn't be bumming
he mustn't be bumming
we mustn't be bumming
you mustn't be bumming
they mustn't be bumming	I mustn't have bummed
you mustn't have bummed
he mustn't have bummed
we mustn't have bummed
you mustn't have bummed
they mustn't have bummed	I mustn't have been bumming
you mustn't have been bumming
he mustn't have been bumming
we mustn't have been bumming
you mustn't have been bumming
they mustn't have been bumming	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I bum?
must you bum?
must he bum?
must we bum?
must you bum?
must they bum? 	must I be bumming?
must you be bumming?
must he be bumming?
must we be bumming?
must you be bumming?
must they be bumming? 	must I have bummed?
must you have bummed?
must he have bummed?
must we have bummed?
must you have bummed?
must they have bummed? 	must I have been bumming?
must you have been bumming?
must he have been bumming?
must we have been bumming?
must you have been bumming?
must they have been bumming? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I bum?
mustn't you bum?
mustn't he bum?
mustn't we bum?
mustn't you bum?
mustn't they bum? 	mustn't I be bumming?
mustn't you be bumming?
mustn't he be bumming?
mustn't we be bumming?
mustn't you be bumming?
mustn't they be bumming? 	mustn't I have bummed?
mustn't you have bummed?
mustn't he have bummed?
mustn't we have bummed?
mustn't you have bummed?
mustn't they have bummed? 	mustn't I have been bumming?
mustn't you have been bumming?
mustn't he have been bumming?
mustn't we have been bumming?
mustn't you have been bumming?
mustn't they have been bumming?