English verb conjugation
COULD LUFF

Regular verb: luff - luffed - luffed

Affirmation

Simple form	V-ing form
I could luff you could luff she could luff we could luff you could luff they could luff	I could be luffing you could be luffing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she luff? could we luff? could you luff? could they luff?	could I be luffing? could you be luffing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been luffing? couldn't we have been luffing? couldn't you have been luffing? couldn't they have been luffing?