为什么英语里既有in the school 又有at school之说

at school、in school、in the school有什么区别? in school/in the school和at school/at the school有什么区别? at the school与 in the school有何区别? in the school,in school 与 at school at school和in the school和in school区别 请问in school,at school,in the school和at the school的用法, at school和at the school和in school 和in the school 的区别 in the front of the school与at the frount of the school有什么区别? 英语里have breakfast at school 不加the 可为什么swimming at the pool要加 at the same school与in the same school有什么不同 at the same school 和in the same school有什么区别? 英语什么时候用the?为什么arrive at school中,school前不加the?