English verb conjugation
COULD FUR

Regular verb: fur - furred - furred

Affirmation

Simple form	V-ing form
I could fur you could fur he could fur we could fur you could fur they could fur	I could be furring you could be furring he could be furring we could be furring you could be furring they could be furring
Perfect	V-ing perfect
I could have furred you could have furred he could have furred we could have furred you could have furred they could have furred	I could have been furring you could have been furring he could have been furring we could have been furring you could have been furring they could have been furring

Negation

Simple form	V-ing form
I couldn't fur you couldn't fur he couldn't fur we couldn't fur you couldn't fur they couldn't fur	I couldn't be furring you couldn't be furring he couldn't be furring we couldn't be furring you couldn't be furring they couldn't be furring
Perfect	V-ing perfect
I couldn't have furred you couldn't have furred he couldn't have furred we couldn't have furred you couldn't have furred they couldn't have furred	I couldn't have been furring you couldn't have been furring he couldn't have been furring we couldn't have been furring you couldn't have been furring they couldn't have been furring

Interrogative form

Simple form	V-ing form
could I fur? could you fur? could he fur? could we fur? could you fur? could they fur?	could I be furring? could you be furring? could he be furring? could we be furring? could you be furring? could they be furring?
Perfect	V-ing perfect
could I have furred? could you have furred? could he have furred? could we have furred? could you have furred? could they have furred?	could I have been furring? could you have been furring? could he have been furring? could we have been furring? could you have been furring? could they have been furring?

Interro-negative form

Simple form	V-ing form
couldn't I fur? couldn't you fur? couldn't he fur? couldn't we fur? couldn't you fur? couldn't they fur?	couldn't I be furring? couldn't you be furring? couldn't he be furring? couldn't we be furring? couldn't you be furring? couldn't they be furring?
Perfect	V-ing perfect
couldn't I have furred? couldn't you have furred? couldn't he have furred? couldn't we have furred? couldn't you have furred? couldn't they have furred?	couldn't I have been furring? couldn't you have been furring? couldn't he have been furring? couldn't we have been furring? couldn't you have been furring? couldn't they have been furring?