假設語氣英文 | Second Conditional 完整指南 + 20 例句練習

台灣很多英語學習者在看到 “If I were you…” 或 “If I won the lottery…” 這類句子時，會直覺地用現在式回應，結果說出了文法錯誤的英文。假設語氣（Second Conditional）是英文文法中最重要、也最容易被混淆的句型之一。根據多益（TOEIC）考試資料，假設語氣相關題目在語法部分佔比約 8–12%，是高分考生的必備工具。這篇指南從零帶你掌握完整用法、常見錯誤和 20 個實用例句。

什麼是假設語氣（Second Conditional）？ [What Is It?]

Second conditional sentences imagine a different path — one you’re not currently on.

假設語氣，英文叫做 Second Conditional 或 Conditional Type 2，用來描述「與現在或未來事實相反的假設情境」。白話說，就是在談一件「目前不可能」或「不太可能」發生的事。

和第一條件句（First Conditional）不同，First Conditional 談的是「真實可能發生的事」（”If it rains, I will take an umbrella.” 如果下雨，我會帶傘——真的可能下雨），而 Second Conditional 談的是想像中、不現實的情境（”If I had wings, I would fly to work.” 如果我有翅膀——我沒有）。

這個句型在日常英語中極為常見，特別是在討論夢想、願望、給建議（”If I were you, I would…”）的時候。掌握它，你的英文表達能力會馬上跨越一個等級。

Second Conditional 句型結構 [Grammar Structure | 文法句型]

基本公式：

兩個子句的順序可以互換：「I would travel every month if I had more money.」效果相同，但主句放前面時，後置 if 子句不加逗號。

注意 “were” 的特殊用法： 當 if 子句的主詞是 I、he、she、it 時，正式英語用 were（不是 was）。例如：「If I were the boss, I would change the dress code.」這是假設語氣的特殊規則，在 TOEIC 和學術寫作中很常見。雖然口語中 “If I was…” 也能被接受，但考試和正式場合一律用 were。

否定句： 在 if 子句加 didn’t / weren’t：「If I didn’t work so late, I would sleep better.」主句加 wouldn’t：「If I had the money, I wouldn’t stay in cheap hotels.」

Taiwan 學習者最常犯的 3 個假設語氣錯誤 [Common Mistakes]

Regular practice with conditional sentences accelerates your grammar accuracy.

根據台灣英文教學現場的觀察，學生在使用假設語氣時幾乎都會踩到以下三個坑：

錯誤一：在 If 子句裡放 “would”

這是最常見的錯誤，幾乎每個台灣學生都犯過。

❌ 잘못된: “If I would have time, I would study more.”
✅ Correct: “If I had time, I would study more.”

“Would” 只放在主要子句（結果子句），絕對不放在 If 條件子句裡。記住這個鐵則就能避免這個錯誤。

錯誤二：混淆第一和第二條件句

「If I study tonight, I will pass the test.」（第一條件句：真實可能——你真的打算讀書）
「If I studied more, I would pass the test.」（第二條件句：現實中你沒在認真讀——這是想像）

時態是關鍵：First Conditional 用現在式 + will；Second Conditional 用過去式 + would。意思完全不同。

錯誤三：正式場合把 “was” 當 “were” 用

日常口語中，「If I was you…」很常見，很多母語者也這樣說。但在正式場合、考試和商業寫作中：

❌ 口語/非正式：「If I was you, I would apologize.」
✅ 正式/考試：「If I were you, I would apologize.」

多益口說和書面測驗都偏好正式用法，備考時一律用 were。更多台灣學習者常見的英文錯誤，請看：台灣人最常犯的英文錯誤完整指南。

20 個日常假設語氣例句 [20 Real-Life Examples | 實用例句]

“If I were the manager, I would change the schedule” — second conditional is everywhere in professional English.

以下 20 個例句涵蓋工作、生活、夢想等不同情境，每句都附上中文翻譯。第一次讀，試著遮住中文翻譯，看你能不能猜出意思：

工作與事業 (Work & Career)

1. “If I spoke better English, I would apply for that international company job.” （如果我英文說得更好，我會去應徵那家國際公司。）
2. “If my boss gave me a raise, I would work even harder.” （如果老闆幫我加薪，我會更努力工作。）
3. “If I owned a company, I would let employees work from home two days a week.” （如果我有公司，我會讓員工每週在家工作兩天。）
4. “If I were the manager, I would change the meeting schedule.” （如果我是主管，我會改掉這個開會安排。）
5. “If this job paid more, I would not be looking for a new one.” （如果這份工作薪水更高，我就不會在找新工作了。）

夢想與願望 (Dreams & Wishes)

6. “If I had a million dollars, I would travel around the world for a year.” （如果我有一百萬美元，我會花一年時間環遊世界。）
7. “If I ~할 수 있었다 live anywhere, I would choose Kyoto.” （如果我可以住在任何地方，我會選京都。）
8. “If I were taller, I would have tried to play professional basketball.” （如果我更高，我會嘗試打職業籃球。）
9. “If time were not a problem, I would learn three more languages.” （如果時間不是問題，我還想再學三種語言。）
10. “If I did not have to work, I would volunteer full-time at an animal shelter.” （如果我不需要工作，我會全職在動物收容所當志工。）

給建議 (Giving Advice – “If I were you…”)

11. “If I were you, I would apologize to her right away.” （如果我是你，我會馬上向她道歉。）
12. “If I were in your situation, I would ask for help instead of suffering alone.” （如果我在你的處境，我會尋求幫助而不是一個人撐著。）
13. “If I were you, I would not sign that contract without reading it carefully.” （如果我是你，我不會沒認真讀就簽那份合約。）
14. “If I were your teacher, I would give you more speaking practice.” （如果我是你的老師，我會讓你多練習口說。）

日常生活 (Everyday Life in Taiwan)

15. “If I lived closer to the MRT, I would not need a scooter.” （如果我住得離捷運近一點，我就不需要機車了。）
16. “If it were not so hot in summer, I would walk to work more often.” （如果夏天不那麼熱，我會更常走路去上班。）
17. “If I 익힌 more often, I would save a lot of money eating out.” （如果我常常自己煮，吃外食就能省很多錢。）
18. “If I were not so tired after work, I would go to the gym every evening.” （如果我下班後不那麼累，我會每天晚上去健身房。）
19. “If my phone had better battery life, I would not carry a power bank everywhere.” （如果我的手機電池更耐用，我就不需要到處帶行動電源。）
20. “If I knew the answer, I would tell you immediately.” （如果我知道答案，我會馬上告訴你。）

First vs Second vs Third Conditional 比較 [Conditional Types Compared]

The second conditional formula: If + past simple, would + base verb.

很多台灣學生搞混三種條件句。這張比較表幫你快速理清差異：

記住關鍵：時態「退一步」代表「越不真實」。First Conditional 從現在看可能的未來；Second Conditional 把動詞退到過去式，代表「不真實的現在假設」；Third Conditional 再退一步，用過去完成式處理「已發生的過去事實」。關於 would 的其他用法，請參考：助動詞（Modal Auxiliary Verbs）完整指南。

練習題：填空測驗 [Practice Exercises | 自我測試]

Writing one conditional sentence daily is one of the fastest ways to internalize the grammar.

學文法最快的方式是立刻動手練習。用括號內的動詞填空，完成以下 Second Conditional 句子：

如何在台灣日常生活中練習假設語氣 [How to Practice Daily]

Each conditional type handles a different level of reality vs imagination.

文法規則記住了，但要真正「用出來」需要刻意練習。以下是三個在台灣日常生活中練習 Second Conditional 的具體方法：

方法一：每天寫一句 “If I were…” 早上打開手機記事本，寫一個關於當天情境的假設句。「If I were not working today, I would go hiking in Yangmingshan.」不需要完美，重要的是養成習慣。一週七句，一個月下來你已經有 28 個練習句子。

方法二：用英文給朋友建議 下次朋友跟你訴苦，試著用 “If I were you, I would…” 給出一句英文建議——哪怕只是在心裡默想。真實溝通情境讓文法記憶更牢固，比反覆背規則有效十倍。

方法三：看 Netflix 時留意假設語氣 開英文字幕，留意角色何時使用 “would”、”if I had”、”if I were” 等句型。美劇《Friends》和《The Office》裡假設語氣出現頻率非常高，是很好的聽力語料。

搭配過去式的扎實基礎，Second Conditional 才能用得自然。想複習 if 子句所需的過去式，請看：過去簡單式 vs 過去進行式完整指南。

影片補充：阿滴帶你懂假設語氣 [Video: Understanding Conditional Sentences]

Testing yourself with fill-in-the-blank exercises locks in conditional grammar faster than re-reading.

台灣最受歡迎的英文 YouTuber 阿滴（Ray Du English）有一集專門講假設語氣，解釋清楚、例句實用，非常適合搭配這篇文章一起複習：

重點整理 [Key Takeaways]

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假設語氣（Second Conditional）用過去式動詞表達「現在不可能或不太可能發生的假設」。公式是 If + 過去簡單式, would + 原形動詞。主詞為 I / he / she / it 時，正式英語用 were（不是 was）。最常見的三個錯誤：在 if 子句加 would、混淆第一和第二條件句、在正式場合用 was。每天一句刻意練習，兩週內你的 Second Conditional 就能自然脫口而出。

출처

1. Perfect English Grammar: The Second Conditional — Comprehensive grammar explanation with examples and exercises
2. British Council: Second Conditional — Official grammar resource with interactive exercises
3. EF English Live: Type 2 Conditional — Clear explanation with real-world usage examples
4. English Cool: 英文假設語氣完整解析 — Chinese-language resource specifically for Taiwan learners