in可以充当介词、副词、形容词，核心意思为在里面，在...里面
prep. 在...期间, 在...之内, 处于...之中, 从事于, 按照, 穿着
ad. 进入, 朝里, 在里面, 在屋里
a. 在里面的
具体用法如下：
(used as a preposition)
1 used to indicate location or position within something
There wasn’t a cloud in the sky.
I like to read in bed.
He saw his reflection in the mirror.
I held her in my arms.
He was wounded in the leg.
We had to stand in line for the tickets. 我们不得不排队买票。
2 to the inside of (a room, container, etc.)
She went in the house.
3 used to indicate that someone or something belongs to or is included as part of something
There are 12 in a dozen. 一打有12个。
4.1 during (a period of time, a season, etc.) 在...期间
It happened in the 1930s.
She likes to travel in the summer.
Call us sometime in the morning.
They plan to open in September.
I lost track of them in all the confusion.
4.2 at the end of (a period of time) 一段时间后
The movie is coming out in a few months. 这部电影几个月后上映。
He got his degree in only three years.
4.3 used to indicate an approximate age or number 表示大致的年龄或数量
She is in her thirties. 她三十多岁。
Our members number in the thousands.
5 used to indicate the method, materials, or form of something 表示所用的方法、材料或形式
I do not understand the note written in French.
The book is bound in leather. 这本书是用皮革装订起来的。
They were covered in mud from head to toe.
She gave us 50 dollars in cash.
The measurements are listed in both inches and centimeters.
The shirts come in three sizes.
I decorated the room in blues and grays.
6 used to indicate the state or condition of someone or something 表示所处的状态或条件
She was in and out of trouble for many years.
He just stood there gaping in amazement. 他目瞪口呆站在那里。
They are in love.
She is in much pain.
Soldiers are in danger now.
The vase broke in pieces.
7 used to indicate how people or things are arranged 表示排列方式
They stood in a circle. 他们站成一圈。
The chairs were placed in a row.
8 used to indicate the conditions that are around someone or something 表示所处条件
I found her sitting in the dark.
Don’t just stand there in the rain.
9 while or as a result of (doing something) 当...的时候，由于
In trying to please everyone, I ended up pleasing no one.
Many mistakes were made in planning the project.
10 used to indicate the manner or purpose of something 表示方式或目的
He did nothing in reply to my challenge.
They left in a hurry.
They went in search of lost treasure. 他们去寻找遗失的宝藏。
She moved to the city in hopes of finding a better job.
They increased the penalties in an attempt to discourage lawbreakers.
We held a banquet in his honor.
I wrote a poem in honor of John and Mary’s marriage. 我写了首诗，祝贺约翰与玛丽结婚。
He donated the painting in memory of his wife. 他捐出这幅画，以此来悼念他妻子。
She wrote poems in praise of freedom.
11 used to make a statement or description more limited or specific in meaning 表示限定或具体化
It measures two feet in length. 长度为两尺。
The idea works in theory, but not in practice. 这构想理论上行得通，实践上行不通。
It makes sense in a way. 某种程度上，这有道理。
12 used to indicate the person who is being described 表示所指的人，可以理解为 像...那样
We've lost a valuable employee in Mike.
You have a true friend in her.
13 used to indicate the object of a belief, opinion, or feeling
I don't know what she sees in him. 我不知道她怎么看他。
14 used to indicate a job or area of activity 表示工作或领域
I hear he’s in advertising. 我听说他从事广告业。
She has a job in marketing.
She’s struggling in math. 她在数学方面很挣扎。
15 used to indicate the existence of something as a part of someone's character 表示性格特征
He has no pity in him. 他没有怜悯之心。
I tried to be tough with them, but I just didn't have it in me. 我试着对他们严厉起来，我不是能严厉起来的那种。
16 wearing (something) as clothes 穿着...
He showed up in his best suit.
The boy in black is my classmate. 穿黑衣服的男生是我同学。
17 used to describe how common something is by comparing a smaller number to a larger number 表示比例
This condition affects one in five Americans. 这种情况影响了五分之一的美国人。
(used as an adverb)
ad. 进入, 朝里, 在里面, 在屋里
The burglars broke in through the kitchen window.
The boss called us in for a conference.
The train isn’t in yet.
The doctor is in.
Pull the car further in.
I can’t seem to fit this piece in.
Please fill in your name and address on the application.
They fenced in the property.
Count me in.
(used as an adjective)
1 popular or fashionable 流行的
Tall boots are in this year.
2 aware of and strongly influenced by what is new and fashionable
It's what the in crowd is wearing this season.
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