おく (B. 357)

Example sentences

(ks). 
明日パーティーをするのでビールを買っておいた・おきました
Since we are having a party tomorrow, I bought some beer for it.
(a). 
今日は昼に客が来るので昼ご飯を早目に食べておいた
Since I'm having a guest at noon today, I had my lunch earlier.
(b). 
来年日本へ行くから少し日本語を勉強しておきます
Since I'm going to Japan next year, I will study a little Japanese ahead of time.

Formation

Vて おく  
  話しておく Talk in advance
  食べておく Eat something in advance