beforehand

Please let me know beforehand if you cannot come.

如果你不能来，请提前告诉我。

We planned the trip beforehand to avoid any problems.

我们提前计划了这次旅行，以避免任何问题。

The ingredients should be prepared beforehand.

食材应该预先准备好。

I warned him beforehand that the meeting might be long.

我事先提醒过他，会议可能会很长。

Tickets must be booked beforehand.

门票必须提前预订。

Please finish the reading beforehand so we can discuss it in class.

请提前读完材料，这样我们上课时才能讨论。