English verb conjugation
COULD FIFE

Regular verb: fife - fifed - fifed

Affirmation

Simple form	V-ing form
I could fife you could fife he could fife we could fife you could fife they could fife	I could be fifing you could be fifing he could be fifing we could be fifing you could be fifing they could be fifing
Perfect	V-ing perfect
I could have fifed you could have fifed he could have fifed we could have fifed you could have fifed they could have fifed	I could have been fifing you could have been fifing he could have been fifing we could have been fifing you could have been fifing they could have been fifing

Negation

Simple form	V-ing form
I couldn't fife you couldn't fife he couldn't fife we couldn't fife you couldn't fife they couldn't fife	I couldn't be fifing you couldn't be fifing he couldn't be fifing we couldn't be fifing you couldn't be fifing they couldn't be fifing
Perfect	V-ing perfect
I couldn't have fifed you couldn't have fifed he couldn't have fifed we couldn't have fifed you couldn't have fifed they couldn't have fifed	I couldn't have been fifing you couldn't have been fifing he couldn't have been fifing we couldn't have been fifing you couldn't have been fifing they couldn't have been fifing

Interrogative form

Simple form	V-ing form
could I fife? could you fife? could he fife? could we fife? could you fife? could they fife?	could I be fifing? could you be fifing? could he be fifing? could we be fifing? could you be fifing? could they be fifing?
Perfect	V-ing perfect
could I have fifed? could you have fifed? could he have fifed? could we have fifed? could you have fifed? could they have fifed?	could I have been fifing? could you have been fifing? could he have been fifing? could we have been fifing? could you have been fifing? could they have been fifing?

Interro-negative form

Simple form	V-ing form
couldn't I fife? couldn't you fife? couldn't he fife? couldn't we fife? couldn't you fife? couldn't they fife?	couldn't I be fifing? couldn't you be fifing? couldn't he be fifing? couldn't we be fifing? couldn't you be fifing? couldn't they be fifing?
Perfect	V-ing perfect
couldn't I have fifed? couldn't you have fifed? couldn't he have fifed? couldn't we have fifed? couldn't you have fifed? couldn't they have fifed?	couldn't I have been fifing? couldn't you have been fifing? couldn't he have been fifing? couldn't we have been fifing? couldn't you have been fifing? couldn't they have been fifing?