"以前我们很安静" 可以用英文表达为 "We were very quiet before"。

这个短语的来源是英文动词 "be" 和形容词 "quiet" 的组合。"Be" 是一个动词，表示存在或状态，在这里用来表示 "我们" 的状态。"Quiet" 是一个形容词，意思是 "安静的"。

下面是一些例句，希望能帮到你：

"We were very quiet before the concert started." (在音乐会开始前，我们非常安静。)
"She was very quiet before the exam, studying hard to make sure she did well." (她在考试前非常安静，努力学习以确保考试成绩优秀。)
"The room was very quiet before the baby woke up and started crying." (在婴儿醒来哭起来之前，房间非常安静。)