English verb conjugation
COULD REEF

Regular verb: reef - reefed - reefed

Affirmation

Simple form	V-ing form
I could reef you could reef he could reef we could reef you could reef they could reef	I could be reefing you could be reefing he could be reefing we could be reefing you could be reefing they could be reefing
Perfect	V-ing perfect
I could have reefed you could have reefed he could have reefed we could have reefed you could have reefed they could have reefed	I could have been reefing you could have been reefing he could have been reefing we could have been reefing you could have been reefing they could have been reefing

Negation

Simple form	V-ing form
I could not reef you could not reef he could not reef we could not reef you could not reef they could not reef	I could not be reefing you could not be reefing he could not be reefing we could not be reefing you could not be reefing they could not be reefing
Perfect	V-ing perfect
I could not have reefed you could not have reefed he could not have reefed we could not have reefed you could not have reefed they could not have reefed	I could not have been reefing you could not have been reefing he could not have been reefing we could not have been reefing you could not have been reefing they could not have been reefing

Interrogative form

Simple form	V-ing form
could I reef? could you reef? could he reef? could we reef? could you reef? could they reef?	could I be reefing? could you be reefing? could he be reefing? could we be reefing? could you be reefing? could they be reefing?
Perfect	V-ing perfect
could I have reefed? could you have reefed? could he have reefed? could we have reefed? could you have reefed? could they have reefed?	could I have been reefing? could you have been reefing? could he have been reefing? could we have been reefing? could you have been reefing? could they have been reefing?

Interro-negative form

Simple form	V-ing form
could I not reef? could you not reef? could he not reef? could we not reef? could you not reef? could they not reef?	could I not be reefing? could you not be reefing? could he not be reefing? could we not be reefing? could you not be reefing? could they not be reefing?
Perfect	V-ing perfect
could I not have reefed? could you not have reefed? could he not have reefed? could we not have reefed? could you not have reefed? could they not have reefed?	could I not have been reefing? could you not have been reefing? could he not have been reefing? could we not have been reefing? could you not have been reefing? could they not have been reefing?