一、對等連接詞 (Coordinating Conjunctions)
用來連接兩個語法結構相同且對等的單字、片語或獨立子句。常用的有七個，可以用縮寫 FANBOYS 來記：
for conj. [fɔr] 因為 (表原因，較少用於口語，語氣較弱)
Used to introduce the reason for something mentioned. (用來引導前面提及事情的原因。)
I stayed home, for it was raining heavily. (我待在家，因為雨下得很大。)
and conj. [ænd] 和；而且；然後
Used to connect words, clauses, or sentences that are to be taken together. (用來連接應一起看待的單字、子句或句子。)
I like apples and oranges. (我喜歡蘋果和柳橙。)
He finished his work and went home. (他完成工作然後回家了。)
nor conj. [nɔr] 也不 (用於否定句連接，後常倒裝)
Used before the second or further of two alternatives, when the first is introduced by 'not', 'neither', etc. (用於否定句中連接第二個或之後的選擇，常與 neither 連用。)
He doesn't like coffee, nor do I. (他不喜歡咖啡，我也不喜歡。)
Neither he nor she came to the party. (他和她都沒有來參加派對。)
but conj. [bʌt] 但是 (表對比或轉折)
Used to introduce a phrase or clause contrasting with what has already been mentioned. (用於引出與前面提及內容相反的片語或子句。)
The book is interesting, but it's very long. (這本書很有趣，但是很長。)
or conj. [ɔr] 或者；否則 (表選擇或結果)
Used to link alternatives. / Otherwise. (用來連接選擇。/ 否則。)
Do you want tea or coffee? (你想要茶還是咖啡？)
Hurry up, or you'll be late. (快點，否則你會遲到。)
yet conj. [jɛt] 然而；但是 (語氣比 but 強) adv. 還(沒)
But at the same time; but nevertheless. / Up until the present time. (但同時；然而。/ 直到現在。)
He studied hard, yet he failed the exam. (他用功讀書，然而考試還是沒及格。)
Have you finished your homework yet? (你做完作業了嗎？ - 副詞)
so conj. [so] 所以 (表結果)
And for this reason; therefore. (因此；所以。)
She was very tired, so she went to bed early. (她非常累，所以很早就上床睡覺了。)
二、從屬連接詞 (Subordinating Conjunctions)
用來引導「從屬子句」（不能獨立存在的句子），使它依附在「主要子句」上，表達時間、原因、條件、讓步、目的、地點等關係。
注意： 從屬連接詞放在句首時，從屬子句後要加逗號。
after conj. [ˋæftɚ] 在...之後
During the period of time following an event. (在某事件之後的時間段內。)
I went home after the party ended. (派對結束後我回家了。)
After the party ended, I went home. (派對結束後，我回家了。)
although / though conj. [ɔlˋðo] / [ðo] 雖然；儘管
In spite of the fact that; even though. (儘管；即使。)
He went out although it was raining. (雖然在下雨，他還是出去了。)
Though he is rich, he is not happy. (雖然他很有錢，但他不快樂。)
注意：Although 通常放句首，Though 可放句首或句中。
as conj. [æz] 當...的時候；因為；如同
While; because; in the way that. (當...時候；因為；如同...。)
As I was walking home, I met John. (當我走回家的時候，我遇到了約翰。- 時間)
As it is late, we should go home. (因為晚了，我們該回家了。- 原因)
Do as I say. (照我說的做。- 如同)
because conj. [bɪˋkɔz] 因為
For the reason that. (因為那個原因。)
I stayed home because I was sick. (我待在家因為我生病了。)
before conj. [bɪˋfor] 在...之前
During the period of time preceding a particular event. (在特定事件之前的時間段內。)
Look before you leap. (三思而後行 / 跳之前先看。)
if conj. [ɪf] 如果 (表條件)
On the condition or supposition that. (在...的條件或假設下。)
If you need help, please let me know. (如果你需要幫助，請讓我知道。)
once conj. [wʌns] 一旦...就...
As soon as; when. (一旦；當...時候。)
Once you understand the rule, it becomes easy. (一旦你理解了規則，它就變容易了。)
since conj. [sɪns] 自從；因為
From a definite past time until now; because. (從過去某個確定時間點直到現在；因為。)
I haven't seen him since he moved away. (自從他搬走後，我就沒見過他了。- 時間)
Since you are tired, you should rest. (既然你累了，你應該休息。- 原因)
so that conj. 以便於；如此一來 (表目的或結果)
With the result or consequence that; in order that. (結果或後果是；為了要。)
He spoke loudly so that everyone could hear. (他大聲說話，以便每個人都能聽到。- 目的)
that conj. [ðæt] (用以引導名詞子句或形容詞子句)
Used to introduce a noun clause or adjective clause. (用來引導名詞子句或形容詞子句。)
I know that he is honest. (我知道他是誠實的。- 名詞子句)
The book that I read was good. (我讀的那本書很好。- 形容詞子句)
till / until conj. [tɪl] / [ʌnˋtɪl] 直到...為止
Up to the point in time or the event mentioned. (直到提及的時間點或事件為止。)
Wait here until I come back. (在這裡等到我回來。)
unless conj. [ʌnˋlɛs] 除非；如果不 (= if...not)
Except if. (除非。)
You won't pass the exam unless you study hard. (除非你努力讀書，否則你不會通過考試。)
when conj. [hwɛn] 當...的時候
At or during the time that. (在...的時候。)
I was sleeping when you called. (你打電話來的時候我正在睡覺。)
whenever conj. [hwɛnˋɛvɚ] 無論何時；每當
At whatever time; on whatever occasion. (在任何時候；在任何場合。)
You can call me whenever you need help. (無論何時你需要幫助都可以打給我。)
where conj. [hwɛr] 在...的地方
At, in, or to which place. (在、於或到哪個地方。)
This is the place where I grew up. (這就是我長大的地方。)
wherever conj. [hwɛrˋɛvɚ] 無論在哪裡
In or to whatever place. (在或到任何地方。)
Sit wherever you like. (你想坐哪裡就坐哪裡。)
whether conj. [ˋhwɛðɚ] 是否 (常與 or not 連用)
Expressing a doubt or choice between alternatives. (表達懷疑或在選項之間做選擇。)
I don't know whether he will come or not. (我不知道他是否會來。)
while conj. [hwaɪl] 當...的時候；然而 (表對比) n. 一段時間
During the time that. / Whereas. / A period of time. (在...的期間。/ 然而。/ 一段時間。)
He read a book while he waited. (他在等待時讀了一本書。)
I like tea, while my brother prefers coffee. (我喜歡茶，然而我弟弟比較喜歡咖啡。)
Let's rest for a while. (我們休息一會兒吧。 - 名詞)
三、相關(對稱)連接詞 (Correlative Conjunctions)
這些連接詞總是成對出現，連接兩個語法結構相同的字詞或片語。
both...and... (兩者都...)
Used to join two related items. (用來連接兩個相關的項目。)
Both my parents and my sister enjoyed the movie. (我父母和我姊姊都喜歡這部電影。)
either...or... (或者...或者...；不是...就是...)
Used to link two alternatives. (用來連接兩個選擇。)
You can choose either tea or coffee. (你可以選擇茶或咖啡。)
neither...nor... (既不...也不...)
Used to link two negative alternatives. (用來連接兩個否定的選擇。)
Neither he nor she knows the answer. (他和她都不知道答案。)
注意：連接主詞時，動詞通常靠近 nor 後面的主詞。
not only...but also... (不僅...而且...)
Used to emphasize that something else is also true. (用來強調另一件事也是真的。)
She is not only smart but also beautiful. (她不僅聰明而且美麗。)
注意：連接的部分結構需對稱；also 有時可省略。
詞彙小叮嚀：
- 連接詞是串連句子的重要工具。
- **對等連接詞 (FANBOYS)** 連接對等的字詞、片語或獨立子句。
- **從屬連接詞** 引導從屬子句，說明時間、原因、條件等，使主要子句意思更完整。
- **相關連接詞** 成對出現，連接對等的結構。
- 熟悉各種連接詞的用法，能讓你的句子更有邏輯、更流暢！