关于WHEN的问题,急求,英语大神快进来.I was in the classroom just now.划线提问（把just now)划去,怎么提问.我有三种答案：1：When you in the classroom? 2: When are you in the classroom?3:When were you in the classroom? 求解,哪种是对的啊.现5分钟内回答.悬赏100.
问题描述：
关于WHEN的问题,急求,英语大神快进来.
I was in the classroom just now.划线提问（把just now)划去,怎么提问.
我有三种答案：1：When you in the classroom? 2: When are you in the classroom?
3:When were you in the classroom? 求解,哪种是对的啊.现5分钟内回答.悬赏100.
答
第三种对。因为划线部分是时间just now
第一中缺少谓语，第二种应该是用过去时态
如有疑问，敬请追问
答
第三种是对的,When were you in the classroom?
原句就是过去式