can mumble
Verbo regular: mumble - mumbled- mumbled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can mumble
you can mumble
he can mumble
we can mumble
you can mumble
they can mumble 	I can be mumbling
you can be mumbling
he can be mumbling
we can be mumbling
you can be mumbling
they can be mumbling	I can have mumbled
you can have mumbled
he can have mumbled
we can have mumbled
you can have mumbled
they can have mumbled	I can have been mumbling
you can have been mumbling
he can have been mumbling
we can have been mumbling
you can have been mumbling
they can have been mumbling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot mumble
you cannot mumble
he cannot mumble
we cannot mumble
you cannot mumble
they cannot mumble 	I cannot be mumbling
you cannot be mumbling
he cannot be mumbling
we cannot be mumbling
you cannot be mumbling
they cannot be mumbling	I cannot have mumbled
you cannot have mumbled
he cannot have mumbled
we cannot have mumbled
you cannot have mumbled
they cannot have mumbled	I cannot have been mumbling
you cannot have been mumbling
he cannot have been mumbling
we cannot have been mumbling
you cannot have been mumbling
they cannot have been mumbling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I mumble?
can you mumble?
can he mumble?
can we mumble?
can you mumble?
can they mumble? 	can I be mumbling?
can you be mumbling?
can he be mumbling?
can we be mumbling?
can you be mumbling?
can they be mumbling? 	can I have mumbled?
can you have mumbled?
can he have mumbled?
can we have mumbled?
can you have mumbled?
can they have mumbled? 	can I have been mumbling?
can you have been mumbling?
can he have been mumbling?
can we have been mumbling?
can you have been mumbling?
can they have been mumbling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not mumble?
can you not mumble?
can he not mumble?
can we not mumble?
can you not mumble?
can they not mumble? 	can I not be mumbling?
can you not be mumbling?
can he not be mumbling?
can we not be mumbling?
can you not be mumbling?
can they not be mumbling? 	can I not have mumbled?
can you not have mumbled?
can he not have mumbled?
can we not have mumbled?
can you not have mumbled?
can they not have mumbled? 	can I not have been mumbling?
can you not have been mumbling?
can he not have been mumbling?
can we not have been mumbling?
can you not have been mumbling?
can they not have been mumbling?