English verb conjugation
CAN LUFF

Regular verb: luff - luffed - luffed

Affirmation

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