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