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