区别在于含义的不同。
1、at school=in school指的是学生在学校上课。
2、in the school=at the school指的是在学校内任职，比如说老师，教导主任等
3、at school也可泛指，而in the school则特指某一所学校。
例句：
①I bet you were good at games when you were at school.
我敢说你上学时体育很棒。
②Should our children be taught to swim at school?
我们的孩子应该在学校学习游泳吗？
③He teaches English in the school all the while.
他一直在这所学校里教英语。
④She plays the flute in the school orchestra.
她在校管弦乐队里吹长笛。
扩展资料
相关句子：
1、There is a subdued atmosphere in the school at exam time.
在考试期间,学校里有一种压抑的氛围.
2、Police are investigating the suspected drug ring at the school.
警方正在调查这所学校的可疑贩毒团伙。
3、Ordinarily she sleeps at the school and goes home only on Saturdays.
她平时住在学校，星期六才回家。
4、Connie did well at school and graduated with honours.
康妮在学校表现很好，以优异的成绩毕业了。
