Question

for介词为什么有时候在句子里意思不一样？它是随句子而变化的吗？

Answer 1

for这个词在不同的语境中有不同的含义，更有不同的用法，会随句子不同而不同。

基本意思：prep.（表示对象）为，给，对;受雇于；为 ;代表（群体、组织）;往；向；前往;（表示意图、目的）用来，为了;代替；代表;替…（感到）；为…（感到）;供…之用；为…所需;（表示可用性）供，为;（表示用途）用作…;（置于名词后）由于，因为;（表示时间）持续;（表示距离）达，计;以…的价格；以…为交换；花费;在（指定的时间）；在…时节;为了（庆祝）;（表示目的地）往，向;关于；至于；对于;（用于引出动词不定式的主语）;（表示相对而言不寻常）就…而言;（表示渴望）愿意做，想要;对…来说适合;相当于；等于;因为;支持；赞成；有利于;（引出所支持或被证明之事）在…方面，有关，关于;（用于引出更多信息或与某性质、事物、行为相关的事物）至于，关于;为了成为；为了进入;以…为代价；作为对…的惩罚;conj.因为；由于…的缘故；鉴于

用法例句：

• headed off for town.出发去城里；

• had a nose for news; eager for fame and fortune.消息灵通；

• 渴求名利prepared lunch for us.为我们准备午餐

• spoke for all the members.代表全体成员发言

• Were they for or against the proposal?他们支持这项议案还是反对呢?

• a substitute for eggs.鸡蛋的替代品；

• took two steps back for every step forward.每前进一步向后退两步。

Answer 2

对呀，介词本身的意思就很多，在不同的句子或者短语中就会有不一样的意思。建议查查字典，记一下例句。比如：
Essential Meaning of for

1 —used to indicate the place someone or something is going to or toward
He just left for the office.

2 —used to indicate the person or thing that something is sent or given to
Are there any letters for me?

3 —used to indicate the thing that something is meant to be used with
There's a separate slot for out-of-town mail.

Full Definition of for (Entry 1 of 5)

1a —used as a function word to indicate purpose
a grant for studying medicine
b —used as a function word to indicate an intended goal
left for home
acted for the best
c —used as a function word to indicate the object or recipient of a perception, desire, or activity
now for a good rest
run for your life
an eye for a bargain

2a : as being or constituting
taken for a fool
eggs for breakfast
b —used as a function word to indicate an actual or implied enumeration or selection
for one thing, the price is too high

3 : because of
can't sleep for the heat
4 —used as a function word to indicate suitability or fitness
it is not for you to choose
ready for action

5a : in place of
go to the store for me
b(1) : on behalf of : REPRESENTING
speaks for the court
(2) : in favor of
all for the plan
6 : in spite of —usually used with all
for all his large size, he moves gracefully
7 : with respect to : CONCERNING
a stickler for detail
heavy for its size
8a —used as a function word to indicate equivalence in exchange
$10 for a hat
, equality in number or quantity
point for point
, or correspondence or correlation
for every one that works, you'll find five that don't
b —used as a function word to indicate number of attempts
0 for 4
9 —used as a function word to indicate duration of time or extent of space
gone for two days

10 : in honor of : AFTER
named for her grandmother

Answer 3

for有多个意思，例如：1.给、对；2.帮助、为了；3.关于；4.代表；5.受雇于。在不同的句子中，可能会有不同的意思。

Answer 4

发姐是为什么有的句子意思不一样，因为英语啊中的饭，他有的时候表达的意思让他和汉不一样

Answer 5

介词本身的意思就很多，在不同的句子或者短语中就会有不一样的意思，尤其是固定搭配