"They are good people" 的英语表达是 "They are good people"。
这是一个非常基本的英语表达，没有特别的来源。
例句：
"My friends are good people." (我的朋友们是好人)
"I bepeve that everyone is fundamentally good people." (我相信每个人都是好人)
"Despite their mistakes, they are still good people." (尽管他们犯了错，但他们仍然是好人)