I can forgather you can forgather he can forgather we can forgather you can forgather they can forgather
V-ing form
I can be forgathering you can be forgathering he can be forgathering we can be forgathering you can be forgathering they can be forgathering
Perfect
I can have forgathered you can have forgathered he can have forgathered we can have forgathered you can have forgathered they can have forgathered
V-ing perfect
I can have been forgathering you can have been forgathering he can have been forgathering we can have been forgathering you can have been forgathering they can have been forgathering
Negation
Simple form
I cannot forgather you cannot forgather he cannot forgather we cannot forgather you cannot forgather they cannot forgather
V-ing form
I cannot be forgathering you cannot be forgathering he cannot be forgathering we cannot be forgathering you cannot be forgathering they cannot be forgathering
Perfect
I cannot have forgathered you cannot have forgathered he cannot have forgathered we cannot have forgathered you cannot have forgathered they cannot have forgathered
V-ing perfect
I cannot have been forgathering you cannot have been forgathering he cannot have been forgathering we cannot have been forgathering you cannot have been forgathering they cannot have been forgathering
Interrogative form
Simple form
can I forgather? can you forgather? can he forgather? can we forgather? can you forgather? can they forgather?
V-ing form
can I be forgathering? can you be forgathering? can he be forgathering? can we be forgathering? can you be forgathering? can they be forgathering?
Perfect
can I have forgathered? can you have forgathered? can he have forgathered? can we have forgathered? can you have forgathered? can they have forgathered?
V-ing perfect
can I have been forgathering? can you have been forgathering? can he have been forgathering? can we have been forgathering? can you have been forgathering? can they have been forgathering?
Interro-negative form
Simple form
can I not forgather? can you not forgather? can he not forgather? can we not forgather? can you not forgather? can they not forgather?
V-ing form
can I not be forgathering? can you not be forgathering? can he not be forgathering? can we not be forgathering? can you not be forgathering? can they not be forgathering?
Perfect
can I not have forgathered? can you not have forgathered? can he not have forgathered? can we not have forgathered? can you not have forgathered? can they not have forgathered?
V-ing perfect
can I not have been forgathering? can you not have been forgathering? can he not have been forgathering? can we not have been forgathering? can you not have been forgathering? can they not have been forgathering?