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①To complete a necessary action before certain time. To finish an action beforehand.
Dekakeru mae ni asa gohan wo tabete okimasu.
I will eat breakfast in advance before I leave.
旅行(りょこう)の前(まえ)に切符(きっぷ)を買(か)っておきます。
I will buy a ticket before the trip.
試験(しけん)の前(まえ)に勉強(べんきょう)をしておきました。
I studied before the exam.
友達(ともだち)が来(く)る前(まえ)にビールを買っておいてください。
Please buy beer before my friends come.
寝(ね)る前(まえ)に薬(くすり)を飲(の)んでおいたほうがいいです。
It is better to take medicine before going to bed.
②To maintain a certain situation as it is. To leave something as it is.
This will apply when you would like to express actions that you would like to continuously be done, or to not stop.
I will keep the window closed!
子供(こども)をソファーの上(うえ)で寝(ね)かせておきました。
I will leave my child sleep on the sofa.
夕方(ゆうがた)まで部屋(へや)のドアを開(あ)けておきました。
I kept the door of the room open until the evening.
熱(あつ)くなるまで水(みず)を出(だ)しておこう。
Let's leave the water run until it gets hot.
テーブルの上(うえ)に本(ほん)を置(お)いておかないでください。
Please do not leave the book on the table.
I will buy a ticket in advance!
I bought a ticket in advance!
It is better to leave it there.
I will read this book in advance!
I read this book in advance!
I will take the medicine in advance!
It is better to take the medicince in advance.
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