I must perdure you must perdure she must perdure we must perdure you must perdure they must perdure
Forma com V-ing
I must be perduring you must be perduring she must be perduring we must be perduring you must be perduring they must be perduring
Perfeito
I must have perdured you must have perdured she must have perdured we must have perdured you must have perdured they must have perdured
Perfeito com V-ing
I must have been perduring you must have been perduring she must have been perduring we must have been perduring you must have been perduring they must have been perduring
Negação
Forma simple
I mustn't perdure you mustn't perdure she mustn't perdure we mustn't perdure you mustn't perdure they mustn't perdure
Forma com V-ing
I mustn't be perduring you mustn't be perduring she mustn't be perduring we mustn't be perduring you mustn't be perduring they mustn't be perduring
Perfeito
I mustn't have perdured you mustn't have perdured she mustn't have perdured we mustn't have perdured you mustn't have perdured they mustn't have perdured
Perfeito com V-ing
I mustn't have been perduring you mustn't have been perduring she mustn't have been perduring we mustn't have been perduring you mustn't have been perduring they mustn't have been perduring
Forma interrogativa
Forma simple
must I perdure? must you perdure? must she perdure? must we perdure? must you perdure? must they perdure?
Forma com V-ing
must I be perduring? must you be perduring? must she be perduring? must we be perduring? must you be perduring? must they be perduring?
Perfeito
must I have perdured? must you have perdured? must she have perdured? must we have perdured? must you have perdured? must they have perdured?
Perfeito com V-ing
must I have been perduring? must you have been perduring? must she have been perduring? must we have been perduring? must you have been perduring? must they have been perduring?
Forma interro-Negação
Forma simple
mustn't I perdure? mustn't you perdure? mustn't she perdure? mustn't we perdure? mustn't you perdure? mustn't they perdure?
Forma com V-ing
mustn't I be perduring? mustn't you be perduring? mustn't she be perduring? mustn't we be perduring? mustn't you be perduring? mustn't they be perduring?
Perfeito
mustn't I have perdured? mustn't you have perdured? mustn't she have perdured? mustn't we have perdured? mustn't you have perdured? mustn't they have perdured?
Perfeito com V-ing
mustn't I have been perduring? mustn't you have been perduring? mustn't she have been perduring? mustn't we have been perduring? mustn't you have been perduring? mustn't they have been perduring?