因为正式英语怎么说

因为正式英语可以译作 "because"。
它来自古英语 "by cause" 的缩写，最早出现在英文中为约13世纪。
例句：
I didn't go to the party because I was sick.（因为我病了，所以我没去参加聚会。）
He couldn't pass the test because he didn't study.（他没有努力学习，所以没有通过考试。）
She's late because there was a lot of traffic.（她迟到了，因为路上堵车。）