Before.
1. Separate. 2. Combined.
1. I went home. School was over.
2. I went home before school was over.
1. The monsoon will burst. The holidays are over.
2. The monsoon will burst before the holidays are over.
1. I went home. School was over.
2. I went home before school was over.
1. The monsoon will burst. The holidays are over.
2. The monsoon will burst before the holidays are over.