英文 which 用法全解析：7大常見錯誤一次搞定，避免混淆讓表達更精準！

在英文學習路上，「which」絕對是出現頻率高、卻超容易用錯的關鍵字！無論是作為疑問詞還是關係代名詞，很多學習者都會在 what vs which、限定與非限定子句、逗點位置等地方踩雷。本文整理出7大最常見錯誤，搭配清晰表格、正確句型與官方語法說明，幫助你徹底搞懂 which 的用法，讓英文說得更道地、寫得更專業。

which 的三大核心用法快速掌握

1. 疑問詞：詢問「哪一個／哪些」，用在有明確選項或範圍時
   → Which book do you want to read?
2. 限定關係代名詞（Restrictive）：必要資訊，不加逗點，常可用 that 取代
   → The movie which we watched yesterday was great.
3. 非限定關係代名詞（Non-restrictive）：補充說明，前後一定要加逗點
   → Taiwan, which is an island, has beautiful mountains.

疑問詞 which：什麼時候用？跟 what 差在哪？

鐵律：有「有限選項或明確範圍」時用 which，沒有就用 what。

情境	錯誤範例	正確範例	說明
有限本書可選	What of these books is yours?	Which of these books is yours?	of + 複數名詞時一定要用 which
已提供顏色選項	What color do you prefer?	Which color do you prefer?	前文有範圍，用 which 更精準

小提醒：口語中很多人混用，但正式寫作與多益、托福、IELTS 都建議遵守這條規則。

關係代名詞 which：限定 vs 非限定一次看懂

類型	例句	中文說明	逗點規則
限定	The car which is red belongs to me.	我有多台車，限定是那台紅色的	不加逗點
非限定	My car, which is red, is very fast.	我只有一台車，紅色只是補充說明	前後加逗點

經典錯誤示範與改正

1. ❌ My sister which lives in Taipei is a doctor.
   ✅ My sister, who lives in Taipei, is a doctor.（指人用 who）
2. ❌ This is the park which I told you about it yesterday.
   ✅ This is the park which I told you about yesterday.（刪掉多餘的 it）
3. ❌ The phone which I use it every day is new.
   ✅ The phone which I use every day is new.

7大 which 常見錯誤總整理（附正確用法）

編號	常見錯誤類型	錯誤例句	正確例句	關鍵提醒
1	which 與 what 混用	What of the apples do you want?	Which of the apples do you want?	有範圍就用 which
2	逗點放錯位置	My dog which is brown is cute.	My dog, which is brown, is cute.（或用 that 不加逗點）	非限定一定要逗點
3	誤用來指人	The man which helped me is kind.	The man who helped me is kind.	指人用 who
4	介系詞 + which 位置錯誤	The box which I put the gift in it is here.	The box which I put the gift in is here.	不能加 it；或用 in which
5	關係詞重複	The book which that I read is interesting.	The book that/which I read is interesting.	只能選一個
6	單複數動詞判斷錯誤	Which of the students are the tallest?	Which of the students is the tallest?（問「哪一位」）	看你要選「一個」還是「多個」
7	沒有範圍卻硬用 which	Which country do you want to visit?	What country do you want to visit?	無限選項用 what

進階句型：介系詞 + which 正式寫作必備

• The company in which I work is growing fast.
  （口語：The company that I work for is growing fast.）
• This is the reason for which she cried.
  （口語：This is the reason why she cried.）

延伸閱讀 – 六月英文怎麼說？5個常見錯誤用法你一定要避免！

結語：學會 which，英文立刻進階！

掌握以上規則，你的英文聽說讀寫都能更精準、地道。想用系統化方式一次鞏固所有重要文法點，並得到個人化診斷與練習嗎？歡迎體驗 英商劍橋和享受英文 的進階語法課程與智能診斷工具，讓你的英文實力再升級！