could reef
Regular verb: reef - reefed- reefed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?