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 could not fur you could not fur he could not fur we could not fur you could not fur they could not fur	I could not be furring you could not be furring he could not be furring we could not be furring you could not be furring they could not be furring
Perfect	V-ing perfect
I could not have furred you could not have furred he could not have furred we could not have furred you could not have furred they could not have furred	I could not have been furring you could not have been furring he could not have been furring we could not have been furring you could not have been furring they could not 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
could I not fur? could you not fur? could he not fur? could we not fur? could you not fur? could they not fur?	could I not be furring? could you not be furring? could he not be furring? could we not be furring? could you not be furring? could they not be furring?
Perfect	V-ing perfect
could I not have furred? could you not have furred? could he not have furred? could we not have furred? could you not have furred? could they not have furred?	could I not have been furring? could you not have been furring? could he not have been furring? could we not have been furring? could you not have been furring? could they not have been furring?