用作状语
We knew they were coming, so we bought some food beforehand.我们知道他们要来,所以预先买了一些食物。
Please inform me of your arrival time beforehand.请事先通知我你抵达的时间。
I wish we'd known about it beforehand.要是我们预先知道这件事就好了。
用作表语
Don't be beforehand in making up your mind.不要过早做决定。
He feared that I should be beforehand with him.他害怕我捷足先登。
