1
[verb of motion] + in
in作为副词，表示进入或朝向内部。
Please come in.
请进来。
进；入；在里面
先理解核心含义，再看它在真实句子里的用法。
进；入；在里面
At or towards the interior of a place or room; so as to be enclosed or surrounded.
Please come in.
请进来。
在定义空间的内部,如建筑物或房间内。
At or towards the interior of a defined space, such as a building or room.
朝向说话者或其他参照点。
Towards the speaker or other reference point.
被某物包围或围住。
So as to be enclosed or surrounded by something.
在某事开始之后
After the beginning of something.
Please come in.
请进来。
The door opened and he walked in.
门开了，他走了进去。
She opened the box and looked in.
她打开盒子往里看。
in作为副词，表示进入或朝向内部。
Please come in.
请进来。
表示在场或在某处。
Is the manager in?
经理在吗？
表示允许进入。
Let the dog in.
让狗进来。
Not this
He came in the room.
Use this
He came into the room.
表示进入某地时，副词'in'不能直接带宾语，应使用介词'into'表示动态进入。
Not this
Please hand your homework.
Use this
Please hand in your homework.
动词短语'hand in'中副词'in'不可省略，否则意思变为'传递'而非'提交'。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
进来
Please come in and sit down.
请进来坐下。
进去
Let's go in; it's starting to rain.
我们进去吧，开始下雨了。
进入
How did you get in without a key?
你没有钥匙是怎么进去的？
在家；在里面
Is your mother in?
你母亲在家吗？
走进来
He walked in without knocking.
他没敲门就走了进来。
让……进来
She opened the door and let the cat in.
她打开门让猫进来。
即将经历（不愉快的事）
We are in for a rough winter.
我们将面临一个严冬。
参与（秘密或计划）
She was in on the surprise party from the start.
她从一开始就参与了惊喜派对的计划。
与...关系好
He is in with the boss, so he gets special treatment.
他和老板关系好，所以受到特殊待遇。
全押。
He went all in on the final hand.
他在最后一手牌全押了。
进来。
Please come in and have a seat.
请进来坐下。
Use In naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 'in' 联想为 '进入'，就像走进门里面。
通常用于表示进入的动作，中性，常见于口语和一般书面语。
注意：作副词时通常不用于句首，而是紧跟在动词之后。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.