What it means
前に means “before doing...” and places one action earlier than another. It follows a verb in the dictionary form: the verb before 前に is the later event, while the main clause describes the earlier event. It is common in everyday instructions, plans, and descriptions of event order.
Usage note
With a verb, use the dictionary form before 前に, even when the main clause is past or polite. Do not use the ます-form directly before 前に.
How to use it
Verb (dictionary form)前に
出かける前に、窓を閉めました。
I closed the window before going out.
Verb (dictionary form)前に
出かける前に、窓を閉めた。
I closed the window before going out.
Example sentences
寝る前に、歯を磨きます。
Before going to bed, I brush my teeth.
学校へ行く前に、朝ご飯を食べます。
Before going to school, I eat breakfast.
映画を見る前に、チケットを買いました。
Before watching the movie, I bought a ticket.