1. in advance [提前；预先]
[构成]:in[在...里] + advance[前进；进展]
例句：You should book the tickets in advance. [你应该提前订票。]
2. in all [总共；总计]
[构成]:in[在...里] + all[全部]
例句：There are 50 students in all. [总共有 50 个学生。]
3. in brief [简言之；总之]
[构成]:in[在...里] + brief[简短的]
例句：In brief, the meeting was a success. [总之，会议很成功。]
4. in common [共同；共有]
[构成]:in[在...里] + common[共同的；普通的]
例句：They have something in common. [他们有一些共同之处。]
5. in danger [在危险中]
[构成]:in[在...里] + danger[危险]
例句：The animals are in danger. [这些动物处于危险之中。]
6. in debt [负债；欠账]
[构成]:in[在...里] + debt[债务]
例句：He is deep in debt. [他负债累累。]
7. in detail [详细地]
[构成]:in[在...里] + detail[细节]
例句：Please explain it in detail. [请详细解释一下。]
8. in fact [事实上；实际上]
[构成]:in[在...里] + fact[事实]
例句：In fact, he is very kind. [事实上，他很善良。]
9. in favor of [支持；赞成]
[构成]:in[在...里] + favor[喜爱；赞同] + of[关于]
例句：I'm in favor of this plan. [我赞成这个计划。]
10. in front of [在...前面]
[构成]:in[在...里] + front[前面] + of[关于]
例句：There is a tree in front of the house. [房子前面有一棵树。]
11. in general [总之；通常；一般而言]
[构成]:in[在...里] + general[一般的；总的]
例句：In general, I like this book. [总的来说，我喜欢这本书。]
12. in hand [在手头；在进行中]
[构成]:in[在...里] + hand[手]
例句：I have enough money in hand. [我手头有足够的钱。]
13. in harmony with [与...协调；与...一致]
[构成]:in[在...里] + harmony[和谐] + with[和...一起]
例句：We should live in harmony with nature. [我们应该与大自然和谐相处。]
14. in hospital [住院]
[构成]:in[在...里] + hospital[医院]
例句：He is in hospital now. [他现在住院了。]
15. in ink [用墨水]
[构成]:in[在...里] + ink[墨水]
例句：Please write in ink. [请用墨水写。]
16. in love [相爱；恋爱中]
[构成]:in[在...里] + love[爱]
例句：They are in love with each other. [他们彼此相爱。]
17. in memory of [纪念]
[构成]:in[在...里] + memory[记忆] + of[关于]
例句：This monument was built in memory of the heroes. [这座纪念碑是为了纪念英雄们而建的。]
18. in need [在困难中；需要帮助]
[构成]:in[在...里] + need[需要]
例句：We should help those in need. [我们应该帮助那些需要帮助的人。]
19. in no time [立刻；马上]
[构成]:in[在...里] + no[不] + time[时间]
例句：He finished the work in no time. [他立刻完成了工作。]
20. in order [整齐；按顺序；状况良好]
[构成]:in[在...里] + order[顺序；命令]
例句：The books are in order on the shelf. [书架上的书摆放得很整齐。]