As 用法，在英文裡怎麼用？”As”常常在英文的句子之中出現，但是它有好幾種不同的意義以及用法，以致於看到它出現的時候，常常會感到困惑，不知道它是代表什麼意思？為了一次解決這個困擾，Let’s talk的Rachna老師整理出了”As”的幾種用法，並列舉例句說明，幫助大家了解。
如果你也不敢確定自己是不是百分之百了解”As”的所有用法，就來看看這篇文章吧！
英文 As 用法與中文意思
1.As 當…時(兩件事同時發生)
As 的一個用法是當成 “While” 或是 “at the same time”，也就是「當….（兩件事同時發生）」的意思。
例：
I watched her as she opened the door.
當她打開門時我看著她。
例：
Turn off the lights as you go out.
你出去的時候把燈關上。
例：John arrived just as I left.
我離開的時候John正好抵達。
例：I had to leave just as the conversation was getting interesting.
就在話題變得有趣的時候，我必須離開了。
例：
As I was walking down the street, I saw Jenny.
當我走在街上時，我看到了珍妮。
2.As 因為…
As 也可以當成「因為」的意思，此時用法類似於“because”，可以放在句首，後面接完整的獨立子句。
例：
As I was feeling tired, I went to bed early.
因為我覺得很累，早早就上床睡覺了。
例：As they live near us, we see them quite often.
因為他們住在附近，所以我們很常見到他們。
例：
As it was raining, we stayed at home.
因為正在下雨，我們決定留在家
3.As 身為…/作為…
例：
A few years ago I worked as a teacher.
幾年前我的職業是一名老師。
例： We use the garage as a workshop.
我們把倉庫當作工作室使用。
例：
Don’t use the knife as a screwdriver.
別把小刀當作螺絲起子用。
4.As if 彷彿、像是…
例：Kelly sounds as if she is got a cold.
Kelly的聲音聽起來像是她感冒了。
例：The house looked as if nobody lived in it.
這房子看起來像是沒有人住在裡面。
例：He ran as if he were running for his life.
他跑得彷彿是在為自己的生命而奔馳。
5.As + 形容詞 + as + （比較的對象）
As 還可以用來表達某人或某樣東西，就跟什麼一樣的意思。此時句子結構通常如下。
As + 形容詞 + As ＋ （主詞+動詞）/名詞
例：
She’s as clever as her sister is.
她跟她姐一樣聰明。
例：
Taiwan’s not as big as Japan.
台灣不像日本那樣大。
例：
He loves spicy food as much as I do.
他跟我一樣喜歡吃辣。
例：
Jenny travels as much as me.
珍妮跟我一樣愛旅行。
6.As 如同、像….
As 也可以用來表示「如同，像…」的意思，也就是 “in the same way”的意思，此時 as 當作連接詞，後面需要接子句（主詞 + 動詞）。
例：
Jenny loves spicy food, as I do.
珍妮喜歡辛辣的食物，就像我一樣。
例：
Do in Rome as the Romans do.
入境隨俗。
關於 As 的各種用法，Rachna 在上面的影片也有完整講解。
上面就是 As 單獨使用時的所有用法整理，另外 As 相關的片語也非常多，例如 as soon as、as well as 、as far as、as long as…等等。這些用法整理如下。
7.as long as 只要
as long as 大致上有三種用法，最常見的用法是表達「只要…」的意思，另一個用法是指「根本就會長達…」的意思。
例： You can come as long as you are quiet.
只要你保持安靜，你就可以來。
例： The meeting could be as long as three hours.
這個會議根本就會長達三小時。
關於 As long as 完整用法教學，請參考下面文章的完整解說。
8.As soon as 一…就
as soon as 的中文意思是指「一…就…」，另外常見的 as soon as possible 意思是指「盡快」的意思。
例：
He left as soon as he saw her.
他一看見她就離開了。
例：
Please reply as soon as possible.
請盡快回信。
9.as far as I know 就我所知
as far as I know 意思是指「就我所知」的意思，as far as I know 這句話出現頻率很高，一定要知道。
例：
As far as I know, She has gone to town.
據我所知，她已經去了城鎮。
例：
As far as I know, Jenny will be away for three months.
據我所知，珍妮將離開三個月。
10.As well as 連同
你也許知道”as well as”這個片語，但你會正確地使用它嗎？很多人把它誤以為”and”的同義詞，但其實它表達的是”not only(不但) … but also(而且)”，在已知的事實外，添加更多資訊的意思。
例：
John, as well as Mary, wants to leave early.
約翰跟瑪莉都想早點離開。
例：
He hurt his arm as well as breaking his leg.
他傷了胳膊，也傷了腿。
As well as 的用法跟 As soon as 、as far as…等相比，又稍微更複雜一些。As well as 完整用法可以參考下面文章。
11.as many as 與 as much as 用法
當你的對象是可數名詞時可以使用”as many as”或”as few as”。
例：
They have as many children as we do.
他們跟我們一樣都有很多小孩。
例：John has as few books as Jane.
約翰跟珍妮一樣都有不少書。
完整的 as many as 與 as much as 用法，可以參考下面文章教學。
上面就是 As 的所有用法教學啦！As 在英文裡面用法非常多變，所以一定要搞清楚它的各種用法唷。
如果你想完整了解 「as ~ as」句型的用法，也可以參考下面文章。
（編輯/霍楚昀）
總結
As 常見有六種用法。
1.As 當…時(兩件事同時發生)
2.As 因為…
3.As 身為…/作為…
4.As if 彷彿、像是…
5.As + 形容詞 + as + （比較的對象）
6.As 如同、像….
跟 As 常常一起連用片語，則有以下用法。
as lons as 只要
As soon as 一…就
as far as I know 就我所知
As well as 連同
除了上面文章內容，你還可以參考下方更多相關英文教學。
更多實用英文
如果你喜歡學習各種英文文法、英文片語、口語英文、英文單字等等，歡迎追蹤全民學英文的 FB 粉絲專頁、Instagram，以及Line 官方帳號。
