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
she can muff
we can muff
you can muff
they can muff 	I can be muffing
you can be muffing
she can be muffing
we can be muffing
you can be muffing
they can be muffing	I can have muffed
you can have muffed
she 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
she 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 cannot muff
you cannot muff
she cannot muff
we cannot muff
you cannot muff
they cannot muff 	I cannot be muffing
you cannot be muffing
she cannot be muffing
we cannot be muffing
you cannot be muffing
they cannot be muffing	I cannot have muffed
you cannot have muffed
she cannot have muffed
we cannot have muffed
you cannot have muffed
they cannot have muffed	I cannot have been muffing
you cannot have been muffing
she cannot have been muffing
we cannot have been muffing
you cannot have been muffing
they cannot have been muffing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I muff?
can you muff?
can she muff?
can we muff?
can you muff?
can they muff? 	can I be muffing?
can you be muffing?
can she be muffing?
can we be muffing?
can you be muffing?
can they be muffing? 	can I have muffed?
can you have muffed?
can she 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 she 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 I not muff?
can you not muff?
can she not muff?
can we not muff?
can you not muff?
can they not muff? 	can I not be muffing?
can you not be muffing?
can she not be muffing?
can we not be muffing?
can you not be muffing?
can they not be muffing? 	can I not have muffed?
can you not have muffed?
can she not have muffed?
can we not have muffed?
can you not have muffed?
can they not have muffed? 	can I not have been muffing?
can you not have been muffing?
can she not have been muffing?
can we not have been muffing?
can you not have been muffing?
can they not have been muffing?