"Return to school at half past five in the afternoon" 用英语可以说成 "Return to school at 5:30 PM" 或 "Come back to school at 5:30 PM"。

"5:30 PM" 是英语表达时间的常用方式，其中 "PM" 是 "post meridiem" 的缩写，意思是 "下午"。

例句：

I'll be back at school at 5:30 PM.
I'll return to school at 5:30 PM.
I'll come back to school at 5:30 PM.

翻译：

我下午五点半会回学校。
我会在下午五点半回到学校。
我会在下午五点半回到学校。