As的四種用法，八種語意- 如何正確使用As?

As要如何用？詞性決定用法

as這個字有連接詞、副詞跟介系詞三種詞性，還可以當準關係代名詞。當它是連接詞時，它的語意可以是因為、當…時候、雖然、隨著、如同這五種意思，當他是介系詞時，語意是作為、以…的身份，當它是副詞時，語意則為一樣地…，修飾形容詞或副詞，常出現在原級比較的句型中。as 這個單字，因為不同詞性，用法差異非常大。

• 從屬連接詞：因為、當…時候、隨著、雖然、如同
• 副詞：一樣地…
• 準關係代名詞：用法跟that很像，但是先行詞要有the same…或such…
• 介系詞：作為、以…的身份

As作為從屬連接詞的五種語意跟句型

as的語意是因為時，用法跟because一樣，在很多情況下，兩個字可以互換。除此之外，as比because正式一點。

1. As it’s a long journey, I packed snacks and drinks for the trip.
   由於路途遙遠，我準備了旅途中的零食和飲料
2. As the weather is nice, let’s have a picnic in the park.
   天氣不錯，我們去公園野餐吧
3. I’m studying hard as I want to pass the exam.
   我正在努力學習，因為我想通過考試
4. As the store is closed, we’ll have to come back tomorrow.
   由於商店關門，我們必須明天再來

as的語意是當…時，用法跟語意和when跟while相近，用於表示某事與另一件事同時發生。在這個語意下，有一個常見片語是just as，語意強調兩個動作或事件恰好同時發生(兩件事非常密切地同時發生)。下面舉例說明as跟just as的分別：
As she left, my phone rang.
當她離開的時候，我的電話響了(這句話不強調兩件事非常密切的同時發生)
Just as I was about to leave, my phone rang.
就在我要離開的時候，我的電話響了(這句話強調的是電話鈴聲恰好發生在即將離開的那一刻)

1. As I was studying for my exam, I listened to classical music to help me focus.
   當我準備考試時，我聽古典音樂來幫助我集中注意力
2. As the storm approached, we quickly shut the windows.
   暴風雨來臨時，我們迅速關上了窗戶
3. As we were hiking, we came across a beautiful waterfall.
   當我們徒步旅行時，我們遇到了一個美麗的瀑布
4. As the clock struck midnight, the New Year began.
   午夜的鐘聲響起，新的一年開始了
5. Her face blushed as she thought of it.
   想到那件事，她的臉就紅了
6. As the train arrived at the station, I realized I left my phone at home.
   當火車到站時，我發現(意識到)我把手機放在家裡了(沒帶手機出門)
7. Just as the concert was ending, the power went out.
   演唱會剛結束，停電了(強調兩件事恰好同時發生)
8. Just as I was about to take a bite of my sandwich, the doorbell rang.
   就在我準備咬一口三明治時，門鈴響了(強調兩件事恰好同時發生)

as的語意是隨著時，用於表示隨著一件事的發展，另一件事同時也在發展。

1. As the game was going on, the crowd was cheering loudly.
   隨著比賽的進行，全場響起了熱烈的歡呼聲
2. As the sun set, the sky turned a beautiful shade of orange.
   隨著夕陽西下，天空染成一片美麗的橘(變成橘色)
3. As the meeting progressed, the discussion became more heated.
   隨著會議的進行，討論變得更加激烈
4. As technology advances, the way we live and work is constantly changing.
   隨著科技的進步，我們的生活和工作方式也在不斷變化
5. As the nation grew, so did what came to be called the American Dream.
   隨著國家的發展，後來被稱為美國夢的東西也在發展
   *請注意這個句型結構，so帶領的句子倒裝

as的語意是雖然時，用法比較特殊，跟though的用法不一樣。下面我們用though的句子，來介紹as當though的時候，句型的變化：
Though it was raining, I went for a walk.
-將be動詞後面的Ving移到句首，though去掉，在主詞it前面加上as ((如果是形容詞或Ｖpp也一樣要移到句首)
-Raining as it was, I went for a walk. 雖然下著雨，我還是去散步
Though she worked hard, she did not get the promotion.
-將動詞後面的副詞移到句首，though去掉，在主詞she前面加上as
-Hard as she worked, she did not get the promotion. 儘管她工作很努力，但她沒有得到晉升
Though he is a child, he has a mature understanding of the world.
-將be動詞後面的名詞移到句首，要記得將不定冠詞要去掉，再將though去掉，在主詞he前面加上as
-Child as he is, he has a mature understanding of the world.雖然他是個孩子，但他對這個世界有著成熟的認識

1. Tired as I am, I will stay up to finish this project.
   雖然我很累，但我會熬夜完成這個項目。
2. Angry as he was, he spoke to his son calmly.
   儘管他很生氣，但他仍然平靜地對他的兒子說話
3. Fast as he ran, he still couldn’t catch up with his competitors.
   他跑得再快，也追不上對手(雖然他跑得很快，依然追不上對手)
4. Girls as they are, they still enjoy playing with trucks and cars.
   儘管她們是女孩，但她們仍然喜歡玩卡車和汽車

as的語意還有如同…那樣、以…的方式的語意

1. As you said, he did not believe me.
   如你所說的，他並不相信我
2. She did as she was told.
   她依照吩咐做了
3. As I was just saying, I think we should consider a different approach.
   正如我剛才所說，我認為我們應該考慮一種不同的方法

As 做為副詞

as還可以做為副詞，用來修飾形容詞或副詞，除此之外，常跟as當連接詞的用法合併，構成形容詞或副詞的原級比較的句子。

1. He was late, as usual.
   他像往常一樣遲到了
2. As with all book covers, good design is vital.
   與所有書籍封面一樣，良好的設計非常重要
3. Father will need to rest as well.
   父親也需要休息(as well的語意是『也』)
4. As soon as I finished my exam, I went to see my friends.
   考試一結束，我就去看朋友
5. The boy was very tall–as tall as an adult.
   這個男孩很高——和成年人一樣高
6. She had to get a car as soon as possible.
   她必須盡快弄到一輛車
7. She swims as fast as a fish.
   她游得像魚一樣快
8. He doesn’t play games as much as he used to.
   他不像以前那樣經常玩遊戲了

As作為準關係代名詞

as也可以當關係代名詞，只能構成形容詞子句。他的用法跟that當關係代名詞很像，可以代替人或是物，但是先行詞必須是the same + 名詞，或是such +名詞。進一步理解請閱讀『as, but, than當準關係代名詞的用法解析與例句』。

1. He has the same book as you.
   她和你有同一本書(兩本書一樣)
2. The dress she wore to the party was the same as mine.
   她參加聚會時穿的裙子和我的一樣
3. As is often the case, the weather forecast was wrong and it rained unexpectedly.
   通常情況下，天氣預報又錯誤的，意外下雨了
4. As is often the case with human emotions, it’s hard to predict how someone will react.
   通常情況下，要預測某人的情緒與反應很難
5. As is often the case in large organizations, communication can be a challenge.
   通常情況下，在大型組織中，溝通是一個挑戰

As 做為介系詞

as還有介系詞的用法，它的語意是身為，作為…的身份。很多人將它跟like混淆，like當介系詞的的語意是像。She is like a teacher.她像個老師，但，事實上，她不是。She works as a teacher.她是老師。

1. He was chosen as captain because of his leadership skills.
   由於他的領導能力，他被選為隊長
2. She moves as gracefully as a dancer.
   她的動作像舞者一樣優雅
3. As a student, I spend most of my time studying.
   作為一名學生，我大部分時間都花在學習上
4. The city is known as a cultural hub.
   這座城市被稱為文化中心(以身為文化樞紐著稱)
5. He worked as a waiter when he was a student.
   他在學生時代做過服務員
6. A coin can been used as a key to this door.
   硬幣可以用作這扇門的鑰匙
7. Van Gogh was regarded as one of the greatest painters of his time.
   梵高被認為是他那個時代最偉大的畫家之一
8. The company regards its employees as its most valuable asset.
   公司視員工為最寶貴的資產

想要進一步了解帶有as的片語、句型與例句，請閱讀「As的用法為何？同義詞有哪些？」

如果你有其他文法或寫作上的疑惑，可以到我們『英文文法』，看看有沒有文章探討相關問題。或者你有其他易混淆的單字上的疑惑，可以到我們『英文單字與片語』專頁，看看有沒有相關文章。如果你對自然發音、句子結構與寫作等英文學習上各個領域的文章有興趣，可以到我們的『文章』頁面。