for
1. prep.
(1)因為，由于 for this reason
(2) 表示時間\距離長度； for three days； He ran for three miles.
(3) 為了 ：What do you come here for?
(4) 表示等價交換： He sold his house for 30,000 dollars.
(5) 開往；前往 We set off for London.
(6) 代；替；代表 Red is for danger.
(7) 用于for + 名詞或代詞 + to + 不定式動詞的名詞短語中
The bell rang for the lesson to begin.
2. conj 因為 （表示推測或附加的原因， 前后為并列句）
It must have rained last night, for the ground is wet.
Kuntta ( a prisoner ) knew day broke, for he heard the birds singing.
盡管for 的用法較多，但記住常用的幾個就可以了。
for的用法的確很多，可用作介詞和連詞，介詞用法尤為豐富。以下詳細列出了用法和句例，供你參考。
for 1 preposition
1
used to say who is intended to get or use something, or where something is intended to be used
I've got a present for you.
Someone left a message for Vicky.
2
in order to help someone or something
I looked after the kids for them.
Let me carry that bag for you.
3
used to say what the purpose of an object, action etc is
for doing something
a knife for cutting bread
What did you do that for?
4
in order to have, do, get, or obtain something
Are you waiting for the bus?
the qualifications necessary for a career in broadcasting
5
used to say how long an action or situation continues for
Bake the cake for 40 minutes.
We had been talking for a good half hour.
6
used to talk about distance
We walked for miles.
Factories stretch for quite a way along the canal.
7
if something is arranged for a particular time, it is planned that it should happen then
I've invited them for 9 o'clock.
A special meeting has been arranged for 18th October.
8
used to say where a person, vehicle etc is going
I set off for work.
the train for Manchester
9
used to say what the price or value of something is
a cheque for a hundred pounds
The diamond was insured for two thousand dollars.
10
because of or as a result of something
If, for any reason, you cannot attend, please inform us.
We could hardly see for the mist.
11
used to say which thing or person your statement or question is related to
I'm sure she's the ideal person for the job.
The questions on this paper are too difficult for 10-year-olds.
12
used to say which person or thing your feelings are directed towards
I came away feeling sorry for poor old George.
My deep love for him still remains.
13
used to say at which meal you eat something
We had pasta for lunch.
14
used to say which company, team etc you belong to
I've worked for the BBC ever since I left university.
Deborah used to play for the A team.
15
supporting or in agreement with something or someone
We have studied the arguments for and against nuclear energy.
How many people voted for the proposal?
16
used to say what a word or sign means
What's the French word for 'happy'?
Red is for danger.
17
used to say that a particular quality of someone or something is surprising when you consider what they are
She looks young for her age.
It's cold for July.
18
as a representative of other people
Paisley claims to speak for the majority of local people.
19
used to say what is possible, difficult, necessary, unusual etc
for somebody/something to do something
It's unusual for Donald to be so bad-tempered.
There is an urgent need for someone to tackle this problem.
20
for each/every
used to say that there is a relationship between one amount and another
For each mistake, you'll lose half a point.
For every three people who agree, you'll find five who don't.
21
something is not for somebody
used to say that something is not the kind of thing that someone likes or will enjoy
City life is not for me.
This book is not for everyone.
22
it is (not) for somebody to do something
used to say whether it is someone's right or duty to do something
It's not for me to tell you what to do.
It will be for you to decide what action you should take.
23
if it wasn't/weren't for somebody/something
also if it hadn't been for somebody/something
used to say who or what prevents or prevented something from happening
If it hadn't been for you, I should have drowned.
24
that's/there's somebody/something for you!
spoken
a) used to say that a particular kind of behaviour or situation is typical of someone or something, especially when you do not expect anything better from that person or thing
I know it's outrageous, but that's Melissa for you.
b) used when you are annoyed or disappointed to say that something is the opposite of the quality you are mentioning
Well, there's gratitude for you! Here am I trying to help and you tell me not to interfere!
25
be (in) for it
spoken to be likely to be blamed or punished
You'll be in for it if she finds out what you've done!
see usage note since
for 2 conjunction
formal
used to introduce the reason for something
synonym becauseI cannot tell whether she is old or young, for I have never seen her.He found it increasingly difficult to read, for his eyesight was beginning to fail.
