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 must not stumble you must not stumble she must not stumble we must not stumble you must not stumble they must not stumble
Forma con V-ing
I must not be stumbling you must not be stumbling she must not be stumbling we must not be stumbling you must not be stumbling they must not be stumbling
Perfecto
I must not have stumbled you must not have stumbled she must not have stumbled we must not have stumbled you must not have stumbled they must not have stumbled
Perfecto con V-ing
I must not have been stumbling you must not have been stumbling she must not have been stumbling we must not have been stumbling you must not have been stumbling they must not 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
must I not stumble? must you not stumble? must she not stumble? must we not stumble? must you not stumble? must they not stumble?
Forma con V-ing
must I not be stumbling? must you not be stumbling? must she not be stumbling? must we not be stumbling? must you not be stumbling? must they not be stumbling?
Perfecto
must I not have stumbled? must you not have stumbled? must she not have stumbled? must we not have stumbled? must you not have stumbled? must they not have stumbled?
Perfecto con V-ing
must I not have been stumbling? must you not have been stumbling? must she not have been stumbling? must we not have been stumbling? must you not have been stumbling? must they not have been stumbling?