I can stumble you can stumble she can stumble we can stumble you can stumble they can stumble
Forma con V-ing
I can be stumbling you can be stumbling she can be stumbling we can be stumbling you can be stumbling they can be stumbling
Perfecto
I can have stumbled you can have stumbled she can have stumbled we can have stumbled you can have stumbled they can have stumbled
Perfecto con V-ing
I can have been stumbling you can have been stumbling she can have been stumbling we can have been stumbling you can have been stumbling they can have been stumbling
Negación
Forma simple
I cannot stumble you cannot stumble she cannot stumble we cannot stumble you cannot stumble they cannot stumble
Forma con V-ing
I cannot be stumbling you cannot be stumbling she cannot be stumbling we cannot be stumbling you cannot be stumbling they cannot be stumbling
Perfecto
I cannot have stumbled you cannot have stumbled she cannot have stumbled we cannot have stumbled you cannot have stumbled they cannot have stumbled
Perfecto con V-ing
I cannot have been stumbling you cannot have been stumbling she cannot have been stumbling we cannot have been stumbling you cannot have been stumbling they cannot have been stumbling
Forma interrogativa
Forma simple
can I stumble? can you stumble? can she stumble? can we stumble? can you stumble? can they stumble?
Forma con V-ing
can I be stumbling? can you be stumbling? can she be stumbling? can we be stumbling? can you be stumbling? can they be stumbling?
Perfecto
can I have stumbled? can you have stumbled? can she have stumbled? can we have stumbled? can you have stumbled? can they have stumbled?
Perfecto con V-ing
can I have been stumbling? can you have been stumbling? can she have been stumbling? can we have been stumbling? can you have been stumbling? can they have been stumbling?
Forma interro-negativa
Forma simple
can I not stumble? can you not stumble? can she not stumble? can we not stumble? can you not stumble? can they not stumble?
Forma con V-ing
can I not be stumbling? can you not be stumbling? can she not be stumbling? can we not be stumbling? can you not be stumbling? can they not be stumbling?
Perfecto
can I not have stumbled? can you not have stumbled? can she not have stumbled? can we not have stumbled? can you not have stumbled? can they not have stumbled?
Perfecto con V-ing
can I not have been stumbling? can you not have been stumbling? can she not have been stumbling? can we not have been stumbling? can you not have been stumbling? can they not have been stumbling?