They have sent me numerous "goodies" like that over time I've been a user right here (but I'm undoubtedly not an "worker" - I've in no way even been a moderator on any SO web site).知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。The subject in the sentence "Is possibly of you free?" is "either" n