该短语是及物动词短语，结构为：
keep in contact with + 宾语（宾语通常是人、团体、机构等，代表“联系的对象”）表示与某人保持联系：
I try to keep in contact with my high school friends even though we live in different cities.
尽管我们住在不同城市，我仍努力和高中朋友保持联系。
She promised to keep in contact with me while she's studying abroad.
她答应出国留学期间会和我保持联系。
表示与某个组织、公司等保持联系：
Please keep in contact with our customer service if you have any problems with the product.
若产品有问题，请保持与我们客服的联系。
The company tries to keep in contact with its former employees for potential collaboration.
公司试图与前员工保持联系，以寻求潜在合作。
在“keep”前加否定词（don’t/doesn’t/didn’t等），表示“不与……保持联系”：
He doesn’t keep in contact with his ex-girlfriend anymore.
他不再和前女友保持联系了。
Don’t forget to keep in contact with your family when you’re away.
你不在家时别忘了和家人保持联系。
根据语境调整“keep”的时态（现在时、过去时、将来时等）：
We kept in contact with each other during the pandemic.
疫情期间我们一直保持联系。（过去时，强调过去的状态）
I will keep in contact with you once I arrive in New York.
我一到纽约就会和你保持联系。（将来时，强调未来的计划）
keep in touch with：与“keep in contact with”几乎同义，更口语化；
maintain contact with：更正式，常用于书面或商务语境（如“maintain contact with clients” 与客户保持联系）。
"keep in contact with" 是强调“持续联系”的实用短语，核心是“keep + 状态（in contact）+ 联系对象（with sb./sth.）”，适用于日常、职场等多种场景。