can luff
Regular verb: luff - luffed- luffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can luff
you can luff
he can luff
we can luff
you can luff
they can luff 	I can be luffing
you can be luffing
he can be luffing
we can be luffing
you can be luffing
they can be luffing	I can have luffed
you can have luffed
he can have luffed
we can have luffed
you can have luffed
they can have luffed	I can have been luffing
you can have been luffing
he can have been luffing
we can have been luffing
you can have been luffing
they can have been luffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot luff
you cannot luff
he cannot luff
we cannot luff
you cannot luff
they cannot luff 	I cannot be luffing
you cannot be luffing
he cannot be luffing
we cannot be luffing
you cannot be luffing
they cannot be luffing	I cannot have luffed
you cannot have luffed
he cannot have luffed
we cannot have luffed
you cannot have luffed
they cannot have luffed	I cannot have been luffing
you cannot have been luffing
he cannot have been luffing
we cannot have been luffing
you cannot have been luffing
they cannot have been luffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I luff?
can you luff?
can he luff?
can we luff?
can you luff?
can they luff? 	can I be luffing?
can you be luffing?
can he be luffing?
can we be luffing?
can you be luffing?
can they be luffing? 	can I have luffed?
can you have luffed?
can he have luffed?
can we have luffed?
can you have luffed?
can they have luffed? 	can I have been luffing?
can you have been luffing?
can he have been luffing?
can we have been luffing?
can you have been luffing?
can they have been luffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not luff?
can you not luff?
can he not luff?
can we not luff?
can you not luff?
can they not luff? 	can I not be luffing?
can you not be luffing?
can he not be luffing?
can we not be luffing?
can you not be luffing?
can they not be luffing? 	can I not have luffed?
can you not have luffed?
can he not have luffed?
can we not have luffed?
can you not have luffed?
can they not have luffed? 	can I not have been luffing?
can you not have been luffing?
can he not have been luffing?
can we not have been luffing?
can you not have been luffing?
can they not have been luffing?