You talk to some friends before class begins.

你在上课前和几个朋友闲聊。

youdao

Before class begins, sing a song in English to yourself.

课前，唱首英文歌给自己听。

youdao

Before class begins, one must come prepared, with neat attires and proper posture.

上课之前准备妥当，衣冠端正，姿势亦端。

youdao

Following their 4-1 defeat to South Africa in the one-day series, this match is their only first-class fixture before first of two Tests begins in Durban on Thursday.

BBC: Pakistan fall to Peterson spin

However, this time around the tourists have three first-class matches - with South Australia and Australia A still to come - before the first Test begins in Brisbane on 25 November.

BBC: Ashes: Collingwood focused on England not Australia