- expressing the situation of something that is or appears to be enclosed or surrounded by something else在…里, 在…中：
living in London
住在伦敦
dressed in their Sunday best
穿着他们的节日盛装
soak it in warm soapy water
浸在温肥皂水里
she saw it in the rear-view mirror.
她在后视镜里看到了这一幕。
- expressing motion with the result that something ends up within or surrounded by something else进…里, 到…里：
don't put coal in the bath
别把煤放进浴室里
he got in his car and drove off.
他坐进他的小汽车, 开走了。
- expressing a period of time during which an event takes place or a situation remains the case在…期间：
they met in 1885
他们结识于1885年
at one o'clock in the morning
在凌晨一点钟
I hadn't seen him in years.
我几年里都没见过他。
- expressing the length of time before a future event is expected to take place（表示将来）在…以后：
I'll see you in fifteen minutes.
我会在15分钟后见你。
- (often followed by a noun without a determiner) expressing a state or condition在…状态中, 在…情况里（后常跟无限定词的名词）：
to be in love
在恋爱中
I've got to put my affairs in order
我必须把我的事务安排妥当
a woman in her thirties
一个三十几岁的女人
laid out in a straight line.
布置成一直线。
- indicating the quality or aspect with respect to which a judgement is made在…方面：
no discernible difference in quality.
质量方面看不出有什么差别。
- expressing inclusion or involvement包含在…里, 牵涉在…中：
I read it in a book
我是在一本书里看到的
acting in a film.
在一部电影里演出。
- indicating someone's occupation or profession表示职业从事…：
she works in publishing.
她从事出版业。
- indicating the language or medium used用…语言, 以…媒介：
say it in French
用法语说
put it in writing.
写下来。
- indicating the key in which a piece of music is written以…调：
Mozart's Piano Concerto in E flat.
莫扎特降E调钢琴协奏曲。
- with verbal noun as an integral part of (an activity)在（活动）过程中：
in planning public expenditure it is better to be prudent.
在计划公共财政支出过程中还是谨慎点好。
- expressing a value as a proportion of (a whole)（价值）占（总体）…（比例）：
a local income tax running at six pence in the pound.
地方所得税以每镑六便士征收。
- expressing movement with the result that someone or something becomes enclosed or surrounded by something else进, 入：
come in
进来
bring it in
带它进来
presently the admiral breezed in.
一会儿海军上将轻快地走了进来。
- expressing the situation of being enclosed or surrounded by something在里头：
we were locked in.
我们被锁在里头了。
- expressing arrival at a destination到达：
the train got in very late.
火车到得很晚。
- (of the tide) rising or at its highest level（潮汐）上涨; 涨到最高潮。
- predic.(of a person) present at one's home or office（人）在家的; 在办公室的：
we knocked at the door but there was no one in.
我们敲了门, 但没人在。
- informal fashionable〈非正式〉流行的, 时髦的：
pastels and light colours are in this year
今年柔色和淡色很流行
the in thing to do.
时髦事。
- predic.(of the ball in tennis and similar games) landing within the designated playing area（网球及类似运动用球）界内的。
- predic. Cricket batting【板球】正在攻球：
which side is in?
哪边正在攻球？
be in for
- have good reason to expect (typically something unpleasant)必定会遭到, 免不了遭受（尤指坏事）：
it looks as if we're in for a storm.
我们看起来似乎要遭受一场暴风雨。
be in for it
have good reason to expect trouble or retribution势必倒霉; 必遭惩罚。
in all
- 见ALL.
in and out of
- being a frequent visitor to (a house) or frequent inmate of (an institution)频繁出入（房子）; 频繁进出（机构）：
he was in and out of jail for most of his twenties.
他二十几岁时几乎一直频繁进出监狱。
in on
- privy to (a secret)熟悉内情。
in so far as
- 见FAR.
in that
- for the reason that (used to specify the respect in which a statement is true)因为, 由于（用于指明陈述属实的具体方面）：
I was fortunate in that I had friends.
我是幸运的, 因为我有朋友。
in with
- informal enjoying friendly relations with〈非正式〉与…交好：
the Krays were in with a couple of well-known MPs.
克赖一家与几个著名的议员有很好的交情。
the ins and outs
- informal all the details (of something)〈非正式〉详情。