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 must not bum
you must not bum
he must not bum
we must not bum
you must not bum
they must not bum 	I must not be bumming
you must not be bumming
he must not be bumming
we must not be bumming
you must not be bumming
they must not be bumming	I must not have bummed
you must not have bummed
he must not have bummed
we must not have bummed
you must not have bummed
they must not have bummed	I must not have been bumming
you must not have been bumming
he must not have been bumming
we must not have been bumming
you must not have been bumming
they must not 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 	
must I not bum?
must you not bum?
must he not bum?
must we not bum?
must you not bum?
must they not bum? 	must I not be bumming?
must you not be bumming?
must he not be bumming?
must we not be bumming?
must you not be bumming?
must they not be bumming? 	must I not have bummed?
must you not have bummed?
must he not have bummed?
must we not have bummed?
must you not have bummed?
must they not have bummed? 	must I not have been bumming?
must you not have been bumming?
must he not have been bumming?
must we not have been bumming?
must you not have been bumming?
must they not have been bumming?