English verb conjugation
CAN REEF

Regular verb: reef - reefed - reefed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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