Q1) What does "where" refer to in this sentence? I think "where" refers to "the bus".
Q2) If "where" refers to "the bus", can I use "in which" instead of "where"? as in
Good morning, everyone, please take a seat on the bus in which I'll brief you on today's training.
"
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
fire1please take a seat on the bus, in which I'll brief you on today's training.
You need a comma whether you say 'where' or 'in which'. 'where' is a much better choice. If I were you, I'd forget about the other choice.
CJ