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