can muff
Regular verb: muff - muffed- muffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot muff
you cannot muff
he cannot muff
we cannot muff
you cannot muff
they cannot muff 	I cannot be muffing
you cannot be muffing
he cannot be muffing
we cannot be muffing
you cannot be muffing
they cannot be muffing	I cannot have muffed
you cannot have muffed
he 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
he cannot have been muffing
we cannot have been muffing
you cannot have been muffing
they cannot have been muffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not muff?
can you not muff?
can he 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 he 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 he 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 he not have been muffing?
can we not have been muffing?
can you not have been muffing?
can they not have been muffing?