What do you do? お仕事は何ですか？

To ask someone's job, English does not say "What is your job?" in everyday speech. It says "What do you do?" — the present simple you learned in chapter 18, used here to mean "what do you do for a living?". To answer, you must put "a" (or "an" before a vowel sound) in front of a singular job: "I'm a nurse", "She's an engineer", "He's a manager", "They're teachers" (plural drops the article). This is a fixed rule of English: a singular job is always "a / an + job". Three useful patterns say where or for whom you work: "work as a…" + job (I work as a waiter), "work for…" + a company or person (She works for a bank), "work in…" + a place or field (He works in an office / in marketing). Korean and many languages have no article, so learners drop it: "I am teacher" ✗, "She is engineer" ✗ → "I'm a teacher", "She's an engineer" ✓.

人の職業を尋ねるとき、英語は日常で「What is your job?」ではなく「What do you do?」と言う — 第18課の現在形で、ここでは「何をして生計を立てていますか」の意味。答えるときは単数の職業の前に「a」（母音の音の前は「an」）を必ず置く:「I'm a nurse」「She's an engineer」「He's a manager」「They're teachers」（複数は冠詞なし）。これは英語の固定ルール：単数の職業は常に「a / an + 職業」。どこで・誰のために働くかを言う三つの型:「work as a…」+ 職業（I work as a waiter）、「work for…」+ 会社や人（She works for a bank）、「work in…」+ 場所や分野（He works in an office / in marketing）。韓国語や多くの言語には冠詞がないので学習者は落とす:「I am teacher」✗、「She is engineer」✗ →「I'm a teacher」「She's an engineer」✓。