must bur
Verbo regular: bur - bured- bured

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must bur
you must bur
he must bur
we must bur
you must bur
they must bur 	I must be buring
you must be buring
he must be buring
we must be buring
you must be buring
they must be buring	I must have bured
you must have bured
he must have bured
we must have bured
you must have bured
they must have bured	I must have been buring
you must have been buring
he must have been buring
we must have been buring
you must have been buring
they must have been buring	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not bur
you must not bur
he must not bur
we must not bur
you must not bur
they must not bur 	I must not be buring
you must not be buring
he must not be buring
we must not be buring
you must not be buring
they must not be buring	I must not have bured
you must not have bured
he must not have bured
we must not have bured
you must not have bured
they must not have bured	I must not have been buring
you must not have been buring
he must not have been buring
we must not have been buring
you must not have been buring
they must not have been buring	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I bur?
must you bur?
must he bur?
must we bur?
must you bur?
must they bur? 	must I be buring?
must you be buring?
must he be buring?
must we be buring?
must you be buring?
must they be buring? 	must I have bured?
must you have bured?
must he have bured?
must we have bured?
must you have bured?
must they have bured? 	must I have been buring?
must you have been buring?
must he have been buring?
must we have been buring?
must you have been buring?
must they have been buring? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not bur?
must you not bur?
must he not bur?
must we not bur?
must you not bur?
must they not bur? 	must I not be buring?
must you not be buring?
must he not be buring?
must we not be buring?
must you not be buring?
must they not be buring? 	must I not have bured?
must you not have bured?
must he not have bured?
must we not have bured?
must you not have bured?
must they not have bured? 	must I not have been buring?
must you not have been buring?
must he not have been buring?
must we not have been buring?
must you not have been buring?
must they not have been buring?