【问】 be at school(上学，在学校学习)是否可说成be in school?

【答】 在表示“上学”、“在学校学习”这一含义时，英国英语多用be at school：

1. I was at school until almost half past five yesterday. (Wood)

昨天我在学校上课差不多一直上到五点半。

2. We were at school together. (Snow)

我们曾一起上学。

3. Is Susan still at school，or has she left? (Wood)

苏珊还在上课，还是已经放学了?

但是，美国英语有时使用be in school来表示上述含义：

Sid is in school. (CGEL)

希德在上学。