could muffle
Verbo regular: muffle - muffled- muffled

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

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

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

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