1. used to ask about a specific choice from a limited set
用於詢問從有限選項中的特定選擇
Which book do you want to read?
你想讀哪一本書？
Which way should we go?
我們應該走哪條路？
Which Meaning（定義、用法、例句與發音）
which
determiner
快速理解
What does "Which" mean?What are 2-3 core uses of "Which"?
「which」是一個疑問詞或關係詞，用於詢問或指代特定的人、事物或選擇。
- 1
疑問用法
EN: Used to ask about a specific choice from a limited set.
翻譯: 用於詢問從有限選項中的特定選擇。
- 2
限定性關係子句
EN: Introduces a defining relative clause that identifies a specific noun.
翻譯: 引導限定性關係子句，用於識別或定義特定的名詞。
- 3
非限定性關係子句
EN: Introduces a non-defining relative clause that adds extra information.
翻譯: 引導非限定性關係子句，提供額外的補充資訊。
- 4
指代前述內容
EN: Refers back to a whole idea or situation mentioned earlier.
翻譯: 指代前面提到的整個想法或情況。
小提醒：注意「which」和「that」在關係子句中的區別。在限定性子句中，指「物」時兩者常可互換，但在非限定性子句（有逗號隔開）中，只能用「which」，不能用「that」。
發音（How to Pronounce "Which" in English）
How to pronounce "Which" in English?"Which" US vs UK pronunciation
點擊下方的 US / UK 按鈕可播放發音。
Real-life Examples of "Which" from YouTube Videos
South Korea would accept Trump-Kim deal to freeze North Korea’s nuclear programme | BBC News
BBC News
“It comes as South Korea's president Lie Jay Mung has told the BBC that he'd accept a deal with North Korea under which Pyongyang would freeze nuclear weapon production for now, rather than get rid of them altogether.”
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Definitions（定義）
What are the definitions of "Which"?How does "Which" change by context?
2. used to specify one or more things from a known set
用於從已知集合中指定一個或多個事物
I know which answer is correct.
我知道哪個答案是正確的。
Tell me which shoes you like best.
告訴我你最喜歡哪雙鞋。
3. used to introduce a relative clause, providing additional information about a thing
用於引導關係子句，提供關於某事物的額外資訊
The house, which was built in 1920, needs renovation.
那棟房子建於1920年，需要翻新。
This is the book which I told you about.
這就是我跟你提過的那本書。
4. used in non-restrictive clauses to add extra information
用於非限制性子句中，添加額外資訊
My car, which is ten years old, still runs well.
我的車已經十年了，仍然運行良好。
She moved to Paris, which is her favorite city.
她搬到了巴黎，那是她最喜歡的城市。
Grammar & Patterns（句型）
What are common sentence patterns for "Which"?How to make natural sentences with "Which"?
| Pattern | Meaning | Example |
|---|---|---|
| which + noun | 哪一個（用於詢問或指定特定事物） | Which book did you borrow? (你借了哪一本書？) |
| which + of + plural noun/pronoun | （在一組中）哪一個 | Which of these options is correct? (這些選項中哪一個是正確的？) |
| ..., which ... | 用於引導非限定關係子句，提供額外資訊 | The book, which is on the table, is mine. (那本書在桌子上，是我的。) |
| ..., which is why ... | 這就是…的原因 | It was raining, which is why we stayed home. (當時在下雨，這就是我們待在家裡的原因。) |
| which one(s) | 哪一個（用於直接提問或選擇） | There are two doors. Which one should I use? (有兩扇門。我應該用哪一扇？) |
用法說明
How is "Which" different from similar structures?What usage mistakes are common with "Which"?
which 與 that 的區別
- which 引導非限定性關係子句，對先行詞提供額外、非必要的補充資訊。若刪除該子句，主句意思依然完整。子句前後通常有逗號。
- that 引導限定性關係子句，對先行詞的定義至關重要，用於限定或指明是哪一個。若刪除該子句，主句意思可能不完整或改變。子句前後通常沒有逗號。
- 在非限定性子句中（提供額外資訊時），只能用 which，不能用 that。
- 在限定性子句中（指明特定對象時），that 和 which 常可互換，但在正式寫作中，許多人偏好用 that。
對比例句： EN: My car, which is blue, needs a wash. 翻譯: 我的車是藍色的，需要洗一下。
EN:The car that is parked outside is mine.
翻譯:停在外面的那輛車是我的。
總結建議
在提供額外、非必要的補充資訊時使用 which 並加上逗號；在定義或限定先行詞時，使用 that（或 which）且不加逗號。
易混淆對比
What is the difference between "Which" and similar words?How to choose "Which" vs alternatives?
which vs what
「which」用於有限選項或特定範圍內選擇；「what」用於開放式、無限制的提問。
which vs that
「which」引導非限定性關係子句，補充額外資訊；「that」引導限定性關係子句，定義或限制先行詞。
which vs who
「which」用於指事物、動物或團體；「who」專用於指人。
口語用法
How is "Which" used in spoken English?What is the spoken vs formal difference for "Which"?
引述
在口語中，有時會用 "which" 來引述或重複對方剛說過的話，以確認或表達驚訝。 EN: A: I'm moving to Berlin. B: Which is in Germany, right? 翻譯: A: 我要搬到柏林了。 B: 柏林是在德國，對吧？
EN:A: She recommended this obscure book. B: Which you actually read?
翻譯:A: 她推薦了這本冷門的書。 B: 而你居然真的讀了？
語氣強調
在非正式對話中，有時會用 "which" 來引導一個補充說明，帶有強調或戲劇化的語氣。 EN: He forgot our anniversary, which, by the way, is a huge deal. 翻譯: 他忘了我們的紀念日，順帶一提，這可是件大事。
EN:I finally finished the project, which, let me tell you, was a nightmare.
翻譯:我終於完成了那個專案，告訴你，那簡直是一場噩夢。
停頓填充
在思考或組織句子時，有時會用 "which..." 作為一個短暫的停頓填充詞，類似於「那個...」、「就是...」。 EN: The thing we need to discuss is... which... how to allocate the budget. 翻譯: 我們需要討論的事情是...那個...如何分配預算。
EN:I was looking for the file in the, which, in the shared drive.
翻譯:我當時在，就是，在共享硬碟裡找那個檔案。
正式寫作注意：上述口語用法，特別是「停頓填充」和過於鬆散的「語氣強調」，在學術、商業或任何正式書面文件中應避免使用。正式寫作中，"which" 應嚴格用於引導定義性或非定義性關係子句，且結構需完整嚴謹。
常見短語
What common collocations use "Which"?What fixed phrases with "Which" should I remember?
which of
which of + determiner/pronoun + noun
（用於詢問或指定特定群體中的哪一個）
in which
preposition + which
在其中；於此情況下（用於引導關係子句，說明事件發生的情境或方式）
know which
verb + which + noun + infinitive/clause
知道哪一個（用於表達對選擇或辨識的認知）
see which
verb + which + clause
看看哪一個；觀察以確定（用於表示將透過觀察或測試來決定）
during which
preposition + which
在此期間（用於引導關係子句，指稱一段特定的時間）
decide which
verb + which + noun + infinitive/clause
決定哪一個（用於表達在選項中做出選擇）
by which
preposition + which
藉此；透過此方式（用於引導關係子句，說明方法、標準或依據）
常見錯誤
What are common mistakes with "Which"?Which "Which" sentences look correct but are wrong?
×What book do you want to read?
✓Which book do you want to read?
使用 'which' 表示從有限或已知的選項中選擇，而 'what' 用於開放式、範圍未知的提問。當選項明確或有限時，應使用 'which'。
×The house which is on the hill is very old.
✓The house that is on the hill is very old.
在限定性定語從句中（資訊對主句意義至關重要），通常使用 'that' 而非 'which'，尤其是在美式英語中。'which' 更常用於非限定性定語從句（補充資訊，用逗號隔開）。
×This is the city which I told you about it.
✓This is the city which I told you about.
當 'which' 作為關係代名詞，在從句中充當介系詞的賓語時（如 'about which', 'in which'），從句中不應再重複主詞或賓語（如 'it'）。口語中常將介系詞置於句尾。
×The people which live next door are friendly.
✓The people who live next door are friendly.
指代人時，應使用 'who' 或 'that' 作為關係代名詞，而非 'which'。'which' 用於指代事物、動物或概念。
×My laptop which is new already has a problem.
✓My laptop, which is new, already has a problem.
在非限定性定語從句（提供額外、非必要的資訊）中，必須使用逗號將 'which' 引導的從句與主句隔開。缺少逗號會改變句意，可能使句子聽起來不自然或產生歧義。
詞形變化
What are the word forms of "Which"?What are tense/participle forms of "Which"?