身(み)につくto master (e.g. a skill), to become accustomed to (e.g. a lifestyle), to acquire (e.g. a habit), to retain

私(わたし)の体(からだ)には早寝(はやね)早起(はやお)きが身(み)についている。

I have become accustomed to going to bed early and waking up early, and it has become a part of my lifestyle. {to master (e.g. a skill), to become accustomed to (e.g. a lifestyle), to acquire (e.g. a habit), to retain}

英会話(えいかいわ)が身(み)についたので、留学(りゅうがく)へ行(い)く予定(よてい)です。

Since I have mastered English conversation, I plan to study abroad. {to master (e.g. a skill), to become accustomed to (e.g. a lifestyle), to acquire (e.g. a habit), to retain}

きちんとした行儀(ぎょうぎ)作法(さほう)が身(み)についている人(ひと)と結婚(けっこん)したい。

I want to marry someone who has mastered proper manners and etiquette. {to master (e.g. a skill), to become accustomed to (e.g. a lifestyle), to acquire (e.g. a habit), to retain}

教養(きょうよう)はおろか、息子(むすこ)にはまだ基本(きほん)的(てき)なマナーさえ身(み)についていない。

My son lacks not only education but has not even acquired basic manners yet. {to master (e.g. a skill), to become accustomed to (e.g. a lifestyle), to acquire (e.g. a habit), to retain}

芸人(げいにん)をやっていたとあって、彼女(かのじょ)にはユーモアのセンスが身(み)についています。

Having been a comedian, she has acquired a sense of humor. {to master (e.g. a skill), to become accustomed to (e.g. a lifestyle), to acquire (e.g. a habit), to retain}