I could gaff you could gaff she could gaff we could gaff you could gaff they could gaff
V-ing form
I could be gaffing you could be gaffing she could be gaffing we could be gaffing you could be gaffing they could be gaffing
Perfect
I could have gaffed you could have gaffed she 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 she 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 she 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 she 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 she 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 she 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 she gaff? could we gaff? could you gaff? could they gaff?
V-ing form
could I be gaffing? could you be gaffing? could she be gaffing? could we be gaffing? could you be gaffing? could they be gaffing?
Perfect
could I have gaffed? could you have gaffed? could she 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 she 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 she 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 she 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 she 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 she not have been gaffing? could we not have been gaffing? could you not have been gaffing? could they not have been gaffing?