关于“在家里”的英语表达，以下是综合整理：

一、核心翻译

基本表达

- at home

这是最常用的表达，例如：

- The children are playing at home.

- I prefer to stay at home on weekends.

扩展表达

- in one's home

强调“自己家中”，例如：

- The family gathering was held in my home.

- on one's residence

适用于更正式的场合，例如：

- The diplomat resides in his official residence.

- within the walls of my own abode

更具文学化表达，例如：

- The artist found inspiration within the walls of his home.

- in my domicile

法律文书等正式文本中常用，例如：

- The tenant is required to maintain the domicile in good condition.

二、相关短语与用法

常用短语

- stay at home：

强调“待在家里”，例如：

- The weather is bad, so I'll stay at home.

- stay in：可表示“暂住”，例如：

- We'll stay in my grandparents' house for the holidays.

- keep indoors：侧重“待在室内”，例如：

- It's cold outside, please keep indoors.

- lodge with：表示“寄宿他人家中”，例如：

- The students lodged with a local family during the summer.

固定搭配

- on one's own dunghill：

比喻“家中称王”，例如：

- Every cock is king on its own dunghill.

- keep the house：口语化表达，意为“待在家里”，例如：

- The kids got into trouble, so we had to keep the house.

三、注意事项

介词选择：使用 at home作为副词短语时无需加介词，例如：

*He always finishes his homework at home.*

语境差异：

日常交流优先使用 at home，

正式文件建议采用 in one's home/domicile等表达。通过以上表达，可根据具体语境灵活选择最贴切的翻译。