I could engulf you could engulf she could engulf we could engulf you could engulf they could engulf
V-ing form
I could be engulfing you could be engulfing she could be engulfing we could be engulfing you could be engulfing they could be engulfing
Perfect
I could have engulfed you could have engulfed she could have engulfed we could have engulfed you could have engulfed they could have engulfed
V-ing perfect
I could have been engulfing you could have been engulfing she could have been engulfing we could have been engulfing you could have been engulfing they could have been engulfing
Negation
Simple form
I could not engulf you could not engulf she could not engulf we could not engulf you could not engulf they could not engulf
V-ing form
I could not be engulfing you could not be engulfing she could not be engulfing we could not be engulfing you could not be engulfing they could not be engulfing
Perfect
I could not have engulfed you could not have engulfed she could not have engulfed we could not have engulfed you could not have engulfed they could not have engulfed
V-ing perfect
I could not have been engulfing you could not have been engulfing she could not have been engulfing we could not have been engulfing you could not have been engulfing they could not have been engulfing
Interrogative form
Simple form
could I engulf? could you engulf? could she engulf? could we engulf? could you engulf? could they engulf?
V-ing form
could I be engulfing? could you be engulfing? could she be engulfing? could we be engulfing? could you be engulfing? could they be engulfing?
Perfect
could I have engulfed? could you have engulfed? could she have engulfed? could we have engulfed? could you have engulfed? could they have engulfed?
V-ing perfect
could I have been engulfing? could you have been engulfing? could she have been engulfing? could we have been engulfing? could you have been engulfing? could they have been engulfing?
Interro-negative form
Simple form
could I not engulf? could you not engulf? could she not engulf? could we not engulf? could you not engulf? could they not engulf?
V-ing form
could I not be engulfing? could you not be engulfing? could she not be engulfing? could we not be engulfing? could you not be engulfing? could they not be engulfing?
Perfect
could I not have engulfed? could you not have engulfed? could she not have engulfed? could we not have engulfed? could you not have engulfed? could they not have engulfed?
V-ing perfect
could I not have been engulfing? could you not have been engulfing? could she not have been engulfing? could we not have been engulfing? could you not have been engulfing? could they not have been engulfing?