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