I must buzz you must buzz she must buzz we must buzz you must buzz they must buzz
Forma con V-ing
I must be buzzing you must be buzzing she must be buzzing we must be buzzing you must be buzzing they must be buzzing
Perfecto
I must have buzzed you must have buzzed she must have buzzed we must have buzzed you must have buzzed they must have buzzed
Perfecto con V-ing
I must have been buzzing you must have been buzzing she must have been buzzing we must have been buzzing you must have been buzzing they must have been buzzing
Negación
Forma simple
I mustn't buzz you mustn't buzz she mustn't buzz we mustn't buzz you mustn't buzz they mustn't buzz
Forma con V-ing
I mustn't be buzzing you mustn't be buzzing she mustn't be buzzing we mustn't be buzzing you mustn't be buzzing they mustn't be buzzing
Perfecto
I mustn't have buzzed you mustn't have buzzed she mustn't have buzzed we mustn't have buzzed you mustn't have buzzed they mustn't have buzzed
Perfecto con V-ing
I mustn't have been buzzing you mustn't have been buzzing she mustn't have been buzzing we mustn't have been buzzing you mustn't have been buzzing they mustn't have been buzzing
Forma interrogativa
Forma simple
must I buzz? must you buzz? must she buzz? must we buzz? must you buzz? must they buzz?
Forma con V-ing
must I be buzzing? must you be buzzing? must she be buzzing? must we be buzzing? must you be buzzing? must they be buzzing?
Perfecto
must I have buzzed? must you have buzzed? must she have buzzed? must we have buzzed? must you have buzzed? must they have buzzed?
Perfecto con V-ing
must I have been buzzing? must you have been buzzing? must she have been buzzing? must we have been buzzing? must you have been buzzing? must they have been buzzing?
Forma interro-negativa
Forma simple
mustn't I buzz? mustn't you buzz? mustn't she buzz? mustn't we buzz? mustn't you buzz? mustn't they buzz?
Forma con V-ing
mustn't I be buzzing? mustn't you be buzzing? mustn't she be buzzing? mustn't we be buzzing? mustn't you be buzzing? mustn't they be buzzing?
Perfecto
mustn't I have buzzed? mustn't you have buzzed? mustn't she have buzzed? mustn't we have buzzed? mustn't you have buzzed? mustn't they have buzzed?
Perfecto con V-ing
mustn't I have been buzzing? mustn't you have been buzzing? mustn't she have been buzzing? mustn't we have been buzzing? mustn't you have been buzzing? mustn't they have been buzzing?