没错，英语完全可以说 go to sb's school，其中的 one's 可以是 my, his, her, our, their 等，根据不同语境可以表示“去某人的学校”“上某人的学校”等。网友句子的意思是：

About 3000 children go to our school. 大约3000儿童在我们学校求学。

又如：

The husband and wife went to his school just now. 这对夫妇刚才去了他的学校。

His girlfriend used to go to our school. 他的女朋友曾在我们学校就读。

The majority of children in town go to our school. 镇上大部分儿童都就读于我们的学校。

You know which girls go to our school by the clothes they wear. 根据所穿衣服你就可以知道哪些女孩就读我们学校。