for 當介系詞 （prep.）的13個用法
1.向；對；為.
Sea air is good for the health.
海上的空氣對健康有益。
It is time for school.
是上學的時候了。
It is for you to make the move.
現在該你走一步了(下棋)。
A party was given for her.
為她舉行一次宴會。
He is fit for nothing.
他一無長處。
to work for one's living
為生活而工作。
to fight for one's country
為國而戰
to go for a walk (swim, ride, etc.)
出去散步(游泳，騎馬等)
to send for a doctor 派人去請醫生
a house for travelers to stay at
供旅客暫住的房子
a cure for toothache
治牙痛的藥
horses for riding
供騎乘的馬
2.給；與；適於
a present for a good boy
給好孩子的禮物
I bought it for you.
這個是買給你的。
This letter is for me.
還封信是我的。
Get one for me.
給我拿一個。
books for children
適合兒童的讀物
This meat is not fit for food.
這肉不適於作食物。
Smoking is bad for your health.
吸菸對你的嗓子有害。
He's just the man for the position.
他正是適合這位置的人。
3.以~為目的地；開往~的。
to sail(leave) for New York
啟航(啓程)到紐約
the train for San Francisco
開往舊金山的火車
4.交换;替代; 代表
I sold the horse for $10.
我把馬賣了十塊錢。
I paid 5 pounds for it.
我付了五鎊買它。
to change one thing for another
以一件東西換另一件
We used boxes for chairs.
我們用箱子代替椅子。
This big box will serve us for a table.
這個大箱子可以做我們的桌子。
I would not do it for $100.
給我一百元我還不願做。
You must plant a young tree for every one you cut down.
你每砍倒一根樹，就必須補種一株樹苗。
His father gave him a check for $20.
他的父親給他一張二十元的支票。
A lawyer acts for his client.
律師代表他的委託人行動。
The letters P. M. stand for Prime Minister.
P.M. 兩字母代表 Prime Minister (首相)。
5.因爲;為了
for many reasons
爲了許多理由
He was punished for stealing.
他因偷竊而受處罰。
He was rewarded for saving the girl's life.
他因救了這女孩的命而受獎賞。
We could not see for the fog.
因有霧我們看不清楚。
to feel fear for somebody's safety
為某人的安全而擔憂
to dance for joy
因快樂而舞
to be pressed for time
感時間之緊迫
6.贊成；支持(與 against 相反)
Are you against it or for it?
你對此事是反對呢還是贊成?
He voted for Eisenhower.
他投票贊成艾森豪(投艾森豪的票)。
7.作爲;當作
It was built for (=as) a pleasure boat.
這船建作遊艇之用。
The navy trains men for sailors.
海軍訓練部屬為水手。
8.就…而論;雖然
He worked well for such a little fellow.
就他這樣一個小夥子而論,他工作得不錯。
It was rather cold for August.
以八月天而論,這算是很冷了。
He is tall for his age.
就他的年齡而論,他是高的。
He is still poor for all he has worked.
雖然他很努力工作,他仍然很窮。
For all his faults, we like him still.
雖然它有很多缺點,我們仍喜歡他。
For all his wealth, he was unhappy.
雖然他很有錢,但他仍不快樂。
9. 經過(多少時間或距離)(注意for常被省略)
We stayed (for) three days (a week, a long time, etc.).
我們逗留了三天(一週,很長的時間等) 。
I have been here (for) a week.
我在這裏已一禮拜了。
The war lasted (for) four years.
戰爭延續了四年。
We walked (for) a mile and ran (for) a mile.
我們走了一英里又跑了一英里。
For miles and miles you see nothing but trees.
迢迢千里，除樹以外，不見一物。
The forest stretches (for) a long way.
森林綿延很長。
10. 若要(僅用於下列句式中)
It is impossible for me to go.
要我去是不可能的。
It is difficult for you to master the English language in a short time.
你想要在短期內精通英文是很難的。
11. 希望；渴求；貪求
to hope for fine weather 希望有好天氣
to hunger for knowledge 渴求知識
to be anxious for peace 渴望和平
We long for home.
我們渴望回家。
12. 喜歡；尊敬
to have a liking for music
喜歡音樂
to have a weakness for fine clothes
喜歡漂亮衣服
13. 表示對比
For one enemy he has a hundred friends.
他有一敵而有百友。(敵友之比為一比一百)
as for 至於
but for 如無；如非
But for your help, I should have failed.
如無你的幫助，我恐已失敗。
for all I know
就我所知
He may be in Africa for all I know.
就我所知，他可能在非洲。
for all that
儘管如此；雖然這樣
He says he is innocent, but I'm sure he is guilty.
他說他是無辜的，雖然他這麼說，但我確信他有罪。
for all the world (like) 的確
It looked for all the world (like) a whale.
它看起來真像條鯨魚。
for certain 的確；確實
for ever (and ever) 永遠地
for fear (that) 以免；因恐
He walked fast for fear he should be late.
他快走，以免遲到。
for fear of 因恐
for life 終生
to be a cripple for life 終生為跛者
for the present(=for the time being) 暫時地
for the sake of (or for somebody’s sake) 為了~的緣故
for want(=lack) of 因缺乏~的緣故
For want of money, he could not go abroad.
因為缺錢，他不能去外國。
Oh, for~! 但願有~
Oh, for a fine day!但願有一個晴天!
once for all 最後地；只此一次
to ask for 懇求；探詢
to be in for 免不掉；定要受罰
If you break the school windows, you’ll be in for trouble!
你如果打破學校窗戶，你定會惹出麻煩!
to be out for 有做~的意向
Those noisy fellows seem to be out for trouble.
那些吵鬧的人們好像要找麻煩。
to care for 喜歡；照料
to look for 找尋
to take (someone) for 認某人為
He spoke English so well that he was taken for an English man.
他英文說得那麼好故被認為是個英國人。
to wait for 等候
word for word 逐字地；一字一字地
[連接詞用法]
因；因為
He felt no fear, for he was a brave man.
他不感覺害怕，因他是一個勇者。
We can’t go, for it is raining.
我們沒辦法去，因為正在下雨。
【注意】(1) for 用作連接詞，以連接兩個對等子句時，通常須以一逗點分開之；
如無逗點分開，易被誤為介系詞。
He was glad to go, for the hostess had been especially good to him.
他喜歡去，因為女主人對他一向特別好。
for-【字首】表“離去；禁止；不究；過度；強烈"之義
