discover sb doing sth造句

I discovered my sister reading in the library ———来自★搜问互助四团★团队的『倾Gi简藤』为你尽我的所能答疑，如果你觉得帮助到了你，别忘了五星采纳哦，谢了哦。 (^-^)

The shopkeeper discovered the thief stealing the scarf on the spot.