00004 Chinese character of 在 and pronounce zoi6

The Chinese word【在】that we will introduce this time is a word that describes a state or a place. It is mainly used for the following meanings:

Exist or be located.

Here is the pronunciation of this Chinese character.

Mandarin Pinyin of 【在】:zài

Cantonese Jyutping of 【在】:zoi6

If you’re learning Chinese, 【在】 is a super useful word to master early

It has 6 strokes, reads zài in Mandarin and zoi6 in Cantonese, and you’ll see it everywhere when talking about location, time, and even ongoing actions. In Mandarin, 【在】 is the standard way to say “at/in/on” and also marks something that’s happening right now. In Cantonese speech, people usually use 【喺】 (hai2) for location (for example, 【我喺學校】), while written/formal styles use 【在】. For the “in progress” meaning, Mandarin often uses 【在】 or 【正在】, but Cantonese tends to use 【緊】 or 【喺度＋動作】 (for example, 【我而家喺度學中文】).

At its most basic, 【在】 tells you where someone or something is: 【我在香港】（I’m in Hong Kong）, 【他在教室】（He’s in the classroom）, 【我們在門口等你】（We’re waiting at the door）. You can also put 【在】 + place before the verb to set the scene: 【我在學校吃午飯】（I eat lunch at school） or 【她在圖書館做功課】（She does homework in the library）. It works smoothly with time words too: 【我們在星期五見面】（We’ll meet on Friday）—and in everyday Mandarin, the 【在】 before time can be dropped: 【我們星期五見面】 is also natural.

Another key use is showing an ongoing action. In Mandarin, you’ll hear 【在】 or 【正在】 right before a verb: 【我在等你】 / 【我正在等你】（I’m waiting for you）, 【他在開會】（He’s in a meeting）, 【她在看書】（She’s reading）. The sample sentence 【他在書房裡專注地學習】 nicely shows both location and action: he is studying with focus in the study. In Cantonese, a natural way to express this is 【我而家喺度等你】（I’m waiting for you now）or add 【緊】: 【我而家食緊飯】（I’m eating now）.

There’s also a handy abstract meaning: 【在於】 means “to lie in / to depend on / to be about.” For example, 【成功在於持續的努力】（Success lies in consistent effort）; 【問題在於資訊不完整】（The problem lies in incomplete information）. Notice that 【在於】 is not about physical location—it points to the key factor of something. You’ll often see patterns like 【不在於A，在於B】: 【贏不在於運氣，在於準備】（Winning doesn’t depend on luck; it depends on preparation）.

Two quick tips for learners: first, 【在】 is not the same as 【是】. 【在】 talks about where/when or what’s happening now: 【我在公司】（I’m at the office）, 【我在開車】（I’m driving）. 【是】 identifies or classifies: 【我是工程師】（I am an engineer）. Second, for presence/availability, 【在】 also works in short messages: 【你在嗎？】（Are you there?）, 【他不在】（He’s not here / available）. For yes/no questions, you’ll hear 【在不在】 in Mandarin: 【他在不在家？】（Is he at home?）.

To build your feel for 【在】, here are fresh, learner-friendly examples with similar meanings but different wording: 【她在辦公室準備報告】（She’s in the office preparing a report）, 【我們在公園散步】（We’re taking a walk in the park）, 【我在學中文】 / 【我正在學中文】（I’m learning Chinese）, 【關鍵在於溝通是否清楚】（The key lies in whether the communication is clear）. If you’re reading Cantonese contexts, compare 【喺】 vs. 【在】 and try pairs like 【我喺屋企】（I’m at home, spoken Cantonese） vs. 【我在家】（I’m at home, Mandarin/written）.

Now it’s your turn. Fill in with 【在】／【不在】／【在不在】／【正在】／【在於】:

  1. 【你___圖書館嗎？我想借書。】
  2. 【他___教室，可是老師___。】
  3. 【我___準備明天的面試。】
  4. 【答案的重點___清楚的解釋。】
  5. 【我們___星期五見，你方便嗎？】

Choose the best option in each sentence:
6) 【她___公司開會。（在／正在／在於）】
7) 【成功___長期的練習。（在／正在／在於）】
8) 【你___學中文嗎？（在／在不在／正在）】

Rewrite the yes/no question as a statement with the right form of 【在】:
9) 【他在不在家？】 → （用「在」造肯定句）

Translate into Chinese using 【在】／【正在】／【不在】／【在於】 as needed:
10) I’m working at the café right now.
11) The problem is that the data is missing.
12) She isn’t here; she’s at a meeting.

Here’s a quick answer key to check yourself:

  1. 【在】 → 【你在圖書館嗎？我想借書。】
  2. 【在】【不在】 → 【他在教室，可是老師不在。】
  3. 【正在】 → 【我正在準備明天的面試。】
  4. 【在於】 → 【答案的重點在於清楚的解釋。】
  5. 【在】 → 【我們在星期五見，你方便嗎？】
  6. 【在】 → 【她在公司開會。】
  7. 【在於】 → 【成功在於長期的練習。】
  8. 【在】（or conversational yes/no: 【在不在】）→ 【你在學中文嗎？】
  9. 【他在家。】
  10. 【我現在正在咖啡館工作。】（也可：【我現在在咖啡館工作。】）
  11. 【問題在於資料缺失。】（或：【問題在於資料不完整。】）
  12. 【她不在這裡；她在開會。】

Add‑On to 【在】—How It Differs from 【於】 (Clear, learner‑friendly guide)

If you’ve started to feel comfortable with 【在】 (zài), you’ll soon meet 【於】 (yú). They can both point to “at/in/on” for time or place, but they don’t feel the same in real use. Think of 【在】 as your everyday, conversational friend, and 【於】 as the formal cousin you see in announcements, news, and official writing. Below is a simple, readable guide—with plenty of examples—so you can choose the right one with confidence. (All Chinese is shown inside 【】.)

1) Register & tone: everyday 【在】 vs. formal 【於】

In daily speech and most general writing, 【在】 is the natural choice. In formal notices, headlines, reports, or ceremonial language, 【於】 is common.

  • Everyday: 【我們在學校門口見。】(We’ll meet at the school gate.)
  • Formal: 【本活動於學校正門集合。】(This event assembles at the school’s main gate.)

You’ll also see formal writing push time/place to the front with 【於】 to sound concise:
【會議於明日上午十時開始。】(The meeting starts at 10 a.m. tomorrow morning.)

2) Time & place: often interchangeable, different vibe

Both can mark where or when, but they carry different vibes.

  • Place: 【他在圖書館自習。】(natural, everyday) / 【他於圖書館自習。】(formal)
  • Time: 【我們在星期五開會。】(natural; you can also drop 【在】: 【我們星期五開會】)
    【本活動於星期五舉行。】(formal/announcement style)

3) Ongoing actions: only 【在／正在】, never just 【於】

To show something is happening right now, use 【在】 or 【正在】 before the verb. 【於】 does not do this job.

  • Correct: 【我在等你。】／【我正在等你。】(I’m waiting for you.)
  • Correct: 【她在開會。】(She’s in a meeting.)
  • ✘ Wrong: 【她於開會。】(unnatural/incorrect for progressive meaning)

4) “The key lies in …”: use the set phrase 【在於】

When you talk about the essence, the key, or the reason, use 【在於】 (not a bare 【於】).

  • 【成功在於持續的努力。】(Success lies in consistent effort.)
  • 【問題在於資訊不完整。】(The problem lies in incomplete information.)
  • Contrast: 【不在於A，在於B】 → 【贏不在於運氣，在於準備。】
    (Winning doesn’t depend on luck; it depends on preparation.)

5) Fixed formal collocations: many prefer 【於】

Certain set phrases are strongly tied to 【於】. These sound formal and are widely used in writing:

  • Cause/source/motivation: 【由於】, 【出於】, 【源於】, 【基於】
  • Location: 【位於】
  • Topic/target: 【關於】, 【對於】
  • Comparisons: 【多於】, 【少於】, 【高於】, 【低於】

These are formulaic; replacing 【於】 with 【在】 is usually unnatural. For instance, 【位於市中心】 is idiomatic, while saying 【位在市中心】 is not standard; for everyday speech you’d just say 【在市中心】.

6) Word order & rhythm: formal concision with 【於】

Formal sentences like to put time/place early and use 【於】 for a tight rhythm:

  • Formal: 【演講於周四下午舉行。】
  • Everyday: 【演講在周四下午舉行。】

Both are correct; the first simply feels more official.

7) Cantonese notes (helpful if you hear Cantonese)

In spoken Cantonese, people commonly say 【喺】 (hai2) for location: 【我喺公司】(I’m at the office.). In writing (especially formal), you’ll see 【在】 and 【於】. For progressive actions, Cantonese often uses 【緊】 or 【喺度＋動作】: 【我而家喺度等你】(I’m waiting for you now.). For comparisons, formal writing uses 【多於／少於】, while everyday Cantonese says 【多過／少過】.

  • Spoken: 【我而家喺公司。】
  • Written/formal: 【我現在在公司。】／【我現正於公司。】
  • Comparison: Written/formal 【價格多於一千】 vs. Cantonese 【價錢多過一千】

8) Common pitfalls (and easy fixes)

Learners often overextend 【於】 because it looks elegant. Keep these quick rules in mind:

  • Don’t use 【於】 for the progressive: not 【她於開會】 → say 【她在開會】／【她正在開會】.
  • Don’t replace 【在於】 with a bare 【於】: not 【成功於努力】 → say 【成功在於努力】.
  • Use established 【於】 collocations: 【由於天雨】, 【位於市中心】, 【關於申請流程】, 【多於一百】.
  • When you’re unsure, 【在】 is usually the safe everyday choice for time/place.

Fresh examples (same idea, different wording)

  • 【我們在禮堂集合，十點準時開始。】
    / Formal: 【本活動於禮堂集合，並於十時準時開始。】
  • 【關鍵在於溝通是否清楚。】
    / Variation: 【成敗在於能否清楚溝通。】
  • 【我在準備報告，稍後再回覆。】
    / More formal but still progressive (so no 【於】): 【我正在撰寫報告，稍後回覆。】