must muffle
Verbo regular: muffle - muffled- muffled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must muffle
you must muffle
he must muffle
we must muffle
you must muffle
they must muffle 	I must be muffling
you must be muffling
he must be muffling
we must be muffling
you must be muffling
they must be muffling	I must have muffled
you must have muffled
he must have muffled
we must have muffled
you must have muffled
they must have muffled	I must have been muffling
you must have been muffling
he must have been muffling
we must have been muffling
you must have been muffling
they must have been muffling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't muffle
you mustn't muffle
he mustn't muffle
we mustn't muffle
you mustn't muffle
they mustn't muffle 	I mustn't be muffling
you mustn't be muffling
he mustn't be muffling
we mustn't be muffling
you mustn't be muffling
they mustn't be muffling	I mustn't have muffled
you mustn't have muffled
he mustn't have muffled
we mustn't have muffled
you mustn't have muffled
they mustn't have muffled	I mustn't have been muffling
you mustn't have been muffling
he mustn't have been muffling
we mustn't have been muffling
you mustn't have been muffling
they mustn't have been muffling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I muffle?
must you muffle?
must he muffle?
must we muffle?
must you muffle?
must they muffle? 	must I be muffling?
must you be muffling?
must he be muffling?
must we be muffling?
must you be muffling?
must they be muffling? 	must I have muffled?
must you have muffled?
must he have muffled?
must we have muffled?
must you have muffled?
must they have muffled? 	must I have been muffling?
must you have been muffling?
must he have been muffling?
must we have been muffling?
must you have been muffling?
must they have been muffling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I muffle?
mustn't you muffle?
mustn't he muffle?
mustn't we muffle?
mustn't you muffle?
mustn't they muffle? 	mustn't I be muffling?
mustn't you be muffling?
mustn't he be muffling?
mustn't we be muffling?
mustn't you be muffling?
mustn't they be muffling? 	mustn't I have muffled?
mustn't you have muffled?
mustn't he have muffled?
mustn't we have muffled?
mustn't you have muffled?
mustn't they have muffled? 	mustn't I have been muffling?
mustn't you have been muffling?
mustn't he have been muffling?
mustn't we have been muffling?
mustn't you have been muffling?
mustn't they have been muffling?