English verb conjugation
COULD LEAF

Regular verb: leaf - leafed - leafed

Affirmation

Simple form	V-ing form
I could leaf you could leaf he could leaf we could leaf you could leaf they could leaf	I could be leafing you could be leafing he could be leafing we could be leafing you could be leafing they could be leafing
Perfect	V-ing perfect
I could have leafed you could have leafed he could have leafed we could have leafed you could have leafed they could have leafed	I could have been leafing you could have been leafing he could have been leafing we could have been leafing you could have been leafing they could have been leafing

Negation

Simple form	V-ing form
I couldn't leaf you couldn't leaf he couldn't leaf we couldn't leaf you couldn't leaf they couldn't leaf	I couldn't be leafing you couldn't be leafing he couldn't be leafing we couldn't be leafing you couldn't be leafing they couldn't be leafing
Perfect	V-ing perfect
I couldn't have leafed you couldn't have leafed he couldn't have leafed we couldn't have leafed you couldn't have leafed they couldn't have leafed	I couldn't have been leafing you couldn't have been leafing he couldn't have been leafing we couldn't have been leafing you couldn't have been leafing they couldn't have been leafing

Interrogative form

Simple form	V-ing form
could I leaf? could you leaf? could he leaf? could we leaf? could you leaf? could they leaf?	could I be leafing? could you be leafing? could he be leafing? could we be leafing? could you be leafing? could they be leafing?
Perfect	V-ing perfect
could I have leafed? could you have leafed? could he have leafed? could we have leafed? could you have leafed? could they have leafed?	could I have been leafing? could you have been leafing? could he have been leafing? could we have been leafing? could you have been leafing? could they have been leafing?

Interro-negative form

Simple form	V-ing form
couldn't I leaf? couldn't you leaf? couldn't he leaf? couldn't we leaf? couldn't you leaf? couldn't they leaf?	couldn't I be leafing? couldn't you be leafing? couldn't he be leafing? couldn't we be leafing? couldn't you be leafing? couldn't they be leafing?
Perfect	V-ing perfect
couldn't I have leafed? couldn't you have leafed? couldn't he have leafed? couldn't we have leafed? couldn't you have leafed? couldn't they have leafed?	couldn't I have been leafing? couldn't you have been leafing? couldn't he have been leafing? couldn't we have been leafing? couldn't you have been leafing? couldn't they have been leafing?