must mutter
Verbo regular: mutter - muttered- muttered

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

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

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

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