English verb conjugation
COULD LUFF

Regular verb: luff - luffed - luffed

Affirmation

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

Negation

Simple form	V-ing form
I couldn't luff you couldn't luff he couldn't luff we couldn't luff you couldn't luff they couldn't luff	I couldn't be luffing you couldn't be luffing he couldn't be luffing we couldn't be luffing you couldn't be luffing they couldn't be luffing
Perfect	V-ing perfect
I couldn't have luffed you couldn't have luffed he couldn't have luffed we couldn't have luffed you couldn't have luffed they couldn't have luffed	I couldn't have been luffing you couldn't have been luffing he couldn't have been luffing we couldn't have been luffing you couldn't have been luffing they couldn't have been luffing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
couldn't I luff? couldn't you luff? couldn't he luff? couldn't we luff? couldn't you luff? couldn't they luff?	couldn't I be luffing? couldn't you be luffing? couldn't he be luffing? couldn't we be luffing? couldn't you be luffing? couldn't they be luffing?
Perfect	V-ing perfect
couldn't I have luffed? couldn't you have luffed? couldn't he have luffed? couldn't we have luffed? couldn't you have luffed? couldn't they have luffed?	couldn't I have been luffing? couldn't you have been luffing? couldn't he have been luffing? couldn't we have been luffing? couldn't you have been luffing? couldn't they have been luffing?