在学校后面可以用英语表示为:

behind the school

这个表达的来源是指在学校的后面,也就是在学校的正后方。

例句:

I always play soccer behind the school after class. (我每次课后都会在学校后面踢足球。)
The playground is located behind the school. (操场就位于学校后面。)
There is a small pond behind the school. (学校后面有一个小池塘。)