can stumble
Verbo regolare: stumble - stumbled- stumbled

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I can stumble
you can stumble
he can stumble
we can stumble
you can stumble
they can stumble 	I can be stumbling
you can be stumbling
he can be stumbling
we can be stumbling
you can be stumbling
they can be stumbling	I can have stumbled
you can have stumbled
he can have stumbled
we can have stumbled
you can have stumbled
they can have stumbled	I can have been stumbling
you can have been stumbling
he can have been stumbling
we can have been stumbling
you can have been stumbling
they can have been stumbling	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I cannot stumble
you cannot stumble
he cannot stumble
we cannot stumble
you cannot stumble
they cannot stumble 	I cannot be stumbling
you cannot be stumbling
he cannot be stumbling
we cannot be stumbling
you cannot be stumbling
they cannot be stumbling	I cannot have stumbled
you cannot have stumbled
he cannot have stumbled
we cannot have stumbled
you cannot have stumbled
they cannot have stumbled	I cannot have been stumbling
you cannot have been stumbling
he cannot have been stumbling
we cannot have been stumbling
you cannot have been stumbling
they cannot have been stumbling	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can I stumble?
can you stumble?
can he stumble?
can we stumble?
can you stumble?
can they stumble? 	can I be stumbling?
can you be stumbling?
can he be stumbling?
can we be stumbling?
can you be stumbling?
can they be stumbling? 	can I have stumbled?
can you have stumbled?
can he have stumbled?
can we have stumbled?
can you have stumbled?
can they have stumbled? 	can I have been stumbling?
can you have been stumbling?
can he have been stumbling?
can we have been stumbling?
can you have been stumbling?
can they have been stumbling? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can I not stumble?
can you not stumble?
can he not stumble?
can we not stumble?
can you not stumble?
can they not stumble? 	can I not be stumbling?
can you not be stumbling?
can he not be stumbling?
can we not be stumbling?
can you not be stumbling?
can they not be stumbling? 	can I not have stumbled?
can you not have stumbled?
can he not have stumbled?
can we not have stumbled?
can you not have stumbled?
can they not have stumbled? 	can I not have been stumbling?
can you not have been stumbling?
can he not have been stumbling?
can we not have been stumbling?
can you not have been stumbling?
can they not have been stumbling?