

Подумай, прежде чем отвечать.
Think before you answer.
Прежде чем уйти, выключи свет.
Before you leave, turn off the light.
Помой руки, прежде чем сесть за стол.
Wash your hands before you sit down at the table.
"прежде чем" is in the lesson "Time 2" (Level 35), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.