human
If we are going down, hadn't we better start? said Mrs. Devine.
gpt
If it gets quite dark before we come up, I shall certainly have to stay there until to-morrow. In fact, I'm quite willing to let you and Barbara go without me now.
human
I'm not sure we'll go at all. It seems to me Brooke means to give the thing a private trial before he asks me to come over and see it work, and that's why he waited until it was almost dark. Can you make him out, Barbara?