1. We have studied English for years.
   我們學(xué)英語已有好幾年了。
2. They jumped for joy.
   他們高興地跳了起來。
3. Jim is going to get material for a new book.
   吉姆正打算為一部新書準(zhǔn)備材料。
4. It is for her own good.
   這是為了對她自己有好處。
5. He has a great respect for his father.
   他很敬佩他的父親。
6. What can I do for you?
   要我?guī)兔幔?/div>
7. Are you for or against?
   你是贊成還是反對？
8. He shook his head, for he thought differently.
   他搖搖頭，因為他的想法與此不同。

for

prep.（介詞）

Used to indicate the object, aim, or purpose of an action or activity:
為了：用來指一個動作或活動的目的、目標(biāo)或意圖：
例句：
trained for the ministry; put the house up for sale; plans to run for senator.
為政府部門培訓(xùn)；把房子拍賣；計劃競選議員

Used to indicate a destination:
往，向：用來指目的地：
例句：
headed off for town.
出發(fā)去城里

Used to indicate the object of a desire, an intention, or a perception:
對于：用來指愿望、意圖或感覺的目標(biāo)：
例句：
had a nose for news; eager for fame and fortune.
消息靈通；渴求名利

Used to indicate the recipient or beneficiary of an action:
為：用來指一個活動的接受者或受益者：
例句：
prepared lunch for us.
為我們準(zhǔn)備午餐

On behalf of:
代表：
例句：
spoke for all the members.
代表全體成員發(fā)言

In favor of:
對…支持：
例句：
Were they for or against the proposalô
他們支持這項議案還是反對呢ô

In place of:
代替…：
例句：
a substitute for eggs.
雞蛋的替代品

Used to indicate equivalence or equality:
等值，等量：用于表示等值或相同關(guān)系：
例句：
paid ten dollars for a ticket; repeated the conversation word for word.
花十美元買了張票；逐字逐句地重復(fù)談話

Used to indicate correlation or correspondence:
用于表示關(guān)聯(lián)或聯(lián)系：
例句：
took two steps back for every step forward.
每前進(jìn)一步向后退兩步

Used to indicate amount, extent, or duration:
達(dá)：用于表示數(shù)量、范圍或持續(xù)時間：
例句：
a bill for five dollars; walked for miles; stood in line for several minutes.
五美元的鈔票；步行了數(shù)英里；排了幾分鐘的隊

Used to indicate a specific time:
在：用于表示一個具體時間：
例句：
had an appointment for two o`clock.
兩點鐘有一個約會

As being:
當(dāng)作：
例句：
take for granted; mistook me for the librarian.
視為當(dāng)然；把我誤認(rèn)為是圖書管理員

Used to indicate an actual or implied listing or choosing:
針對…：用于表示實際的或隱含的列舉或選擇：
例句：
For one thing, we can`t afford it.
第一，我們買不起

As a result of; because of:
由于；因為：
例句：
jumped for joy.
因高興而跳起來

Used to indicate appropriateness or suitability:
用于表示適度或適當(dāng)：
例句：
It will be for the judge to decide.
這要由法官來決定

Notwithstanding; despite:
雖然；盡管：
例句：
For all the problems, it was a valuable experience.
盡管還存在許多問題，這仍不失為一次寶貴的經(jīng)驗

As regards; concerning:
關(guān)于；至于：
例句：
a stickler for neatness.
有潔癖的人

Considering the nature or usual character of:
至于：關(guān)于…的性質(zhì)或一般特征：
例句：
was spry for his advanced age.
就他的高齡來說，他應(yīng)該算是充滿生氣的了

In honor of:
為紀(jì)念…：
例句：
named for her grandmother.
為紀(jì)念她的祖母起的名字

conj.（連接詞）
Because; since.
因為；既然

來源：
Middle English
中古英語
from Old English * see per
源自 古英語 *參見 per