Because、Although、However：把邏輯弄破的句子連接詞
Academic Discussion 剩下三分鐘。你有明確的立場、像樣的例子，想先承認對立觀點，再反駁回去。你打出：「Although public transit is cheaper, but it doesn't reach every neighborhood.」然後繼續往下寫。評分者讀到這句會停一下——不是因為想法弱，而是因為兩個連接詞在做同一件事，安靜地互相抵消。歡迎來到 TOEFL Writing 第二常見的文法漏洞。
連接詞是論證的隱形骨架。它們告訴讀者每個想法跟下一個想法的關係：因果、對比、讓步、補充、順序。用得好，就算想法簡單，回答也會顯得有條理；用得差，就算想法強，讀起來也散亂。在時間壓力下，學習者最常伸手抓的就是同樣那三個連接詞——because、although、however——而且絆倒的方式驚人地一致。
為什麼這在 TOEFL iBT 2026 很重要
Reading 中，一段文章的邏輯結構常常就靠單一連接詞轉折。一句以 however、nevertheless 或 on the other hand 開頭，就標示下一個主張與前一個矛盾——而推論題最愛測你有沒有注意到這點。Listening 中，講者用 because 與 although 標示主要想法與限定條件；漏掉訊號就可能在 function 題上失分。
Writing 中，賭注更立即。TOEFL Writing 評分標準明確獎勵「有清楚連結的、發展完整的推理」。連接詞就是這些連結最可見的訊號。把三個好論點羅列卻沒連起來，讀起來像一堆意見的堆疊；把同樣三個論點用精準連接詞接起來，讀起來就是一個論證。
Speaking 中——尤其是 Take an Interview——評分者會留意邏輯標記，因為口語回答短而密集。一個放在正確位置的乾淨 because，可以把回答拉高整整一級。
陷阱
三個連接詞造成大部分損害。它們在日常用法看似可以互換，但在正式英文裡行為很不一樣。
Because。 Because 引導從屬子句，無法單獨成句。「Because public transit is cheaper.」是碎句，不是句子。在時間壓力下，寫作者會把一個長想法拆成兩句，意外把 because 子句留在原地。評分者每次都會注意到。
Although vs. but。 Although 是引導讓步的從屬連接詞；but 是引導對比的對等連接詞。在同一句裡同時用兩個——「Although it is cheaper, but it is slower」——會讓邏輯動作疊一次，造成結構性冗贅。挑一個用；千萬別兩個都用。
However。 However 是副詞，不是連接詞。它無法只靠一個逗號把兩個獨立子句黏在一起。「Public transit is cheaper, however it is slower」就是逗號謬誤。正確形式是 分號 + however + 逗號：「Public transit is cheaper; however, it is slower.」或者拆成兩句：「Public transit is cheaper. However, it is slower.」許多學習者在被人指出之前，已經寫過幾十次逗號謬誤版本。
Nevertheless vs. on the other hand vs. however。 三個都表示對比，但口味不同。However 是中性的，幾乎在任何語體都行。Nevertheless 帶有「儘管我剛剛說了那些」的意味。On the other hand 引入平行的另一面——它很自然地會跟段落前面的「on one hand」配對。把它們當完全同義詞使用，會讓段落讀起來機械化。
So vs. therefore vs. thus。 So 是非正式的，逗號之後在子句開頭用：「It was raining, so we stayed inside.」Therefore 與 thus 是正式的副詞，需要更強的標點：「It was raining; therefore, we stayed inside.」在同一段裡混用非正式與正式形式會破壞語體，尤其在 TOEFL 2026 的 Write an Email 該怎麼寫？回答中，語體本身就是評分項目。
Wrong / Better / Why
| Wrong | Better | 為什麼 |
|---|---|---|
| Although public transit is cheaper, but it doesn't reach every area. | Although public transit is cheaper, it doesn't reach every area. | 用 although 或 but 擇一——兩個做的是同一個讓步動作。 |
| The proposal is reasonable. Because it addresses both costs and access. | The proposal is reasonable because it addresses both costs and access. | 以 because 開頭的子句無法獨立成句。 |
| Many students prefer remote classes, however attendance is harder to track. | Many students prefer remote classes; however, attendance is harder to track. | However 是副詞，需要分號（或新句），不是只有一個逗號。 |
| She studied for weeks, therefore she passed. | She studied for weeks; therefore, she passed. | Therefore 連接兩個獨立子句要用分號。 |
| Despite of the rain, we walked to class. | Despite the rain, we walked to class. | Despite 直接接名詞，不加 of。 |
| In spite the cost, the program is worth it. | In spite of the cost, the program is worth it. | In spite of 永遠帶 of。 |
| He failed the test. So that he had to retake it. | He failed the test, so he had to retake it. | So（結果）是一個字；so that（目的）意思不同。 |
| Public libraries are quiet, also they are free. | Public libraries are quiet, and they are also free. | Also 是副詞，不是對等連接詞——需要一個真正的連接詞或新句。 |
哪裡會出現
Write for an Academic Discussion 與 Academic Discussion。 一篇 130 字的回答通常含兩到三個連接詞，每一個都對評分者很顯眼。短回答裡一個 however 的逗號謬誤，就足以拉低被感受到的組織分。
Write for an Academic Discussion。 Reading 與 lecture 會刻意用 however、on the other hand、nevertheless、despite this 標示兩個來源之間的對比。如果你在摘要裡正確地呼應這些連接詞，就傳達了你理解結構。如果你用模糊的 and 或 also 取代，對比就被壓平了。
Reading 推論題。 題目常繫在單一的 however、yet、while 或 whereas 上。判斷第二個子句是支持、限定還是反駁第一個，就是整道題的全部。
Speaking 任務。 在短口說回答中放一個控制好的 because，能展現推理。避免在口語回答中堆 and... and... and...；一個位置正確的 however 就能讓回答聽起來有組織。
Fast Fix
三條規則能抓到考試壓力下大部分的連接詞錯誤。
第一，以 because 開頭的子句必須與一個主要子句相連。如果一句只寫了「Because students need more time,」把句號拉回來，把子句連到主要想法上。
第二，although 與 but 永遠不共享一句。一旦在句首打出 although，就在腦中把任何稍後想冒出來的 but 擦掉。要嘛單用 but，要嘛單用 although——不要兩個都用。
第三，however、therefore、nevertheless、moreover、furthermore、thus、consequently 在連接兩個子句時都需要分號。在這些字前用逗號，幾乎總是逗號謬誤。安全的替代方式是拆成新句：寫一個句號，再用連接詞 + 逗號開始下一句。
短短第四條規則能幫你的回答更精緻：別讓每一句都用同一個連接詞開頭。如果最後三句都以 however 開頭，用 yet、that said 變化一下，或者把對比放進句子內部重組（「While X is true, Y matters more」）。多樣性讀起來就是控制感。
小練習
- 修好連接詞冗贅：Although the article was short, but it covered all the main points.
- 修好碎句：The professor extended the deadline. Because many students were sick that week.
- 修好逗號謬誤：Online lectures are convenient, however they limit student interaction.
- 選對連接詞並打上正確標點：The data was incomplete (therefore / so / however) the team had to repeat the experiment.
- 用單一精準連接詞改寫：Public libraries are free. They are quiet. Also, they have reliable Wi-Fi.
可能的改進版本：(1) Although the article was short, it covered all the main points. (2) The professor extended the deadline because many students were sick that week. (3) Online lectures are convenient; however, they limit student interaction. (4) The data was incomplete; therefore, the team had to repeat the experiment. (5) Public libraries are free, quiet, and reliably equipped with Wi-Fi.
送出前要檢查什麼
在 Writing 或 Email 任務的最後六十秒，跑一次連接詞掃描。視覺上搜尋每個句首的 because——如果找到，確認它連到一個主要子句。搜尋 however、therefore、nevertheless、moreover、thus、furthermore——每個都需要分號或新句，不能只有孤零零的逗號。搜尋回答中任何位置的 although——如果同句出現 but，刪掉其中一個。最後，在腦中朗讀一遍：如果每句都用同一個連接詞開頭，至少變化其中一個。乾淨的連接詞層次不只是修文法——它能把 Band 4 的回答讓人覺得像 Band 5。