can muff
Verbo regular: muff - muffed- muffed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can muff
you can muff
he can muff
we can muff
you can muff
they can muff 	I can be muffing
you can be muffing
he can be muffing
we can be muffing
you can be muffing
they can be muffing	I can have muffed
you can have muffed
he can have muffed
we can have muffed
you can have muffed
they can have muffed	I can have been muffing
you can have been muffing
he can have been muffing
we can have been muffing
you can have been muffing
they can have been muffing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't muff
you can't muff
he can't muff
we can't muff
you can't muff
they can't muff 	I can't be muffing
you can't be muffing
he can't be muffing
we can't be muffing
you can't be muffing
they can't be muffing	I can't have muffed
you can't have muffed
he can't have muffed
we can't have muffed
you can't have muffed
they can't have muffed	I can't have been muffing
you can't have been muffing
he can't have been muffing
we can't have been muffing
you can't have been muffing
they can't have been muffing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I muff?
can you muff?
can he muff?
can we muff?
can you muff?
can they muff? 	can I be muffing?
can you be muffing?
can he be muffing?
can we be muffing?
can you be muffing?
can they be muffing? 	can I have muffed?
can you have muffed?
can he have muffed?
can we have muffed?
can you have muffed?
can they have muffed? 	can I have been muffing?
can you have been muffing?
can he have been muffing?
can we have been muffing?
can you have been muffing?
can they have been muffing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I muff?
can't you muff?
can't he muff?
can't we muff?
can't you muff?
can't they muff? 	can't I be muffing?
can't you be muffing?
can't he be muffing?
can't we be muffing?
can't you be muffing?
can't they be muffing? 	can't I have muffed?
can't you have muffed?
can't he have muffed?
can't we have muffed?
can't you have muffed?
can't they have muffed? 	can't I have been muffing?
can't you have been muffing?
can't he have been muffing?
can't we have been muffing?
can't you have been muffing?
can't they have been muffing?