I could gaff you could gaff he could gaff we could gaff you could gaff they could gaff
V-ing form
I could be gaffing you could be gaffing he could be gaffing we could be gaffing you could be gaffing they could be gaffing
Perfect
I could have gaffed you could have gaffed he could have gaffed we could have gaffed you could have gaffed they could have gaffed
V-ing perfect
I could have been gaffing you could have been gaffing he could have been gaffing we could have been gaffing you could have been gaffing they could have been gaffing
Negation
Simple form
I could not gaff you could not gaff he could not gaff we could not gaff you could not gaff they could not gaff
V-ing form
I could not be gaffing you could not be gaffing he could not be gaffing we could not be gaffing you could not be gaffing they could not be gaffing
Perfect
I could not have gaffed you could not have gaffed he could not have gaffed we could not have gaffed you could not have gaffed they could not have gaffed
V-ing perfect
I could not have been gaffing you could not have been gaffing he could not have been gaffing we could not have been gaffing you could not have been gaffing they could not have been gaffing
Interrogative form
Simple form
could I gaff? could you gaff? could he gaff? could we gaff? could you gaff? could they gaff?
V-ing form
could I be gaffing? could you be gaffing? could he be gaffing? could we be gaffing? could you be gaffing? could they be gaffing?
Perfect
could I have gaffed? could you have gaffed? could he have gaffed? could we have gaffed? could you have gaffed? could they have gaffed?
V-ing perfect
could I have been gaffing? could you have been gaffing? could he have been gaffing? could we have been gaffing? could you have been gaffing? could they have been gaffing?
Interro-negative form
Simple form
could I not gaff? could you not gaff? could he not gaff? could we not gaff? could you not gaff? could they not gaff?
V-ing form
could I not be gaffing? could you not be gaffing? could he not be gaffing? could we not be gaffing? could you not be gaffing? could they not be gaffing?
Perfect
could I not have gaffed? could you not have gaffed? could he not have gaffed? could we not have gaffed? could you not have gaffed? could they not have gaffed?
V-ing perfect
could I not have been gaffing? could you not have been gaffing? could he not have been gaffing? could we not have been gaffing? could you not have been gaffing? could they not have been gaffing?