must buzz
Verbo regular: buzz - buzzed- buzzed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must buzz
you must buzz
he must buzz
we must buzz
you must buzz
they must buzz 	I must be buzzing
you must be buzzing
he must be buzzing
we must be buzzing
you must be buzzing
they must be buzzing	I must have buzzed
you must have buzzed
he must have buzzed
we must have buzzed
you must have buzzed
they must have buzzed	I must have been buzzing
you must have been buzzing
he must have been buzzing
we must have been buzzing
you must have been buzzing
they must have been buzzing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not buzz
you must not buzz
he must not buzz
we must not buzz
you must not buzz
they must not buzz 	I must not be buzzing
you must not be buzzing
he must not be buzzing
we must not be buzzing
you must not be buzzing
they must not be buzzing	I must not have buzzed
you must not have buzzed
he must not have buzzed
we must not have buzzed
you must not have buzzed
they must not have buzzed	I must not have been buzzing
you must not have been buzzing
he must not have been buzzing
we must not have been buzzing
you must not have been buzzing
they must not have been buzzing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I buzz?
must you buzz?
must he buzz?
must we buzz?
must you buzz?
must they buzz? 	must I be buzzing?
must you be buzzing?
must he be buzzing?
must we be buzzing?
must you be buzzing?
must they be buzzing? 	must I have buzzed?
must you have buzzed?
must he have buzzed?
must we have buzzed?
must you have buzzed?
must they have buzzed? 	must I have been buzzing?
must you have been buzzing?
must he have been buzzing?
must we have been buzzing?
must you have been buzzing?
must they have been buzzing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not buzz?
must you not buzz?
must he not buzz?
must we not buzz?
must you not buzz?
must they not buzz? 	must I not be buzzing?
must you not be buzzing?
must he not be buzzing?
must we not be buzzing?
must you not be buzzing?
must they not be buzzing? 	must I not have buzzed?
must you not have buzzed?
must he not have buzzed?
must we not have buzzed?
must you not have buzzed?
must they not have buzzed? 	must I not have been buzzing?
must you not have been buzzing?
must he not have been buzzing?
must we not have been buzzing?
must you not have been buzzing?
must they not have been buzzing?