can mutter
Verbo regular: mutter - muttered- muttered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can mutter
you can mutter
he can mutter
we can mutter
you can mutter
they can mutter 	I can be muttering
you can be muttering
he can be muttering
we can be muttering
you can be muttering
they can be muttering	I can have muttered
you can have muttered
he can have muttered
we can have muttered
you can have muttered
they can have muttered	I can have been muttering
you can have been muttering
he can have been muttering
we can have been muttering
you can have been muttering
they can have been muttering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot mutter
you cannot mutter
he cannot mutter
we cannot mutter
you cannot mutter
they cannot mutter 	I cannot be muttering
you cannot be muttering
he cannot be muttering
we cannot be muttering
you cannot be muttering
they cannot be muttering	I cannot have muttered
you cannot have muttered
he cannot have muttered
we cannot have muttered
you cannot have muttered
they cannot have muttered	I cannot have been muttering
you cannot have been muttering
he cannot have been muttering
we cannot have been muttering
you cannot have been muttering
they cannot have been muttering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I mutter?
can you mutter?
can he mutter?
can we mutter?
can you mutter?
can they mutter? 	can I be muttering?
can you be muttering?
can he be muttering?
can we be muttering?
can you be muttering?
can they be muttering? 	can I have muttered?
can you have muttered?
can he have muttered?
can we have muttered?
can you have muttered?
can they have muttered? 	can I have been muttering?
can you have been muttering?
can he have been muttering?
can we have been muttering?
can you have been muttering?
can they have been muttering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not mutter?
can you not mutter?
can he not mutter?
can we not mutter?
can you not mutter?
can they not mutter? 	can I not be muttering?
can you not be muttering?
can he not be muttering?
can we not be muttering?
can you not be muttering?
can they not be muttering? 	can I not have muttered?
can you not have muttered?
can he not have muttered?
can we not have muttered?
can you not have muttered?
can they not have muttered? 	can I not have been muttering?
can you not have been muttering?
can he not have been muttering?
can we not have been muttering?
can you not have been muttering?
can they not have been muttering?