before

• 以前一个时期

  in the past

• 一年以前

  one year ago

• 很早以前

  a long time ago

• 解放以前

  before liberation

• 在此以前

  before this

• 八点以前集合

  get together before eight o'clock

• 晚饭以前回来

  come back before dinner

• 以前我不懂这些。

  I didn't understand these before.

• 吃饭以前要洗手。

  You must wash your hands before eating.

• 这是我入学以前的事。

  This is stuff from before I started school.

• 在未得到保证以前，我不会同意。

  I won't agree before getting a guarantee.