1.
keep in with
It's a good idea to keep in with John as he might be helpful to you later.
He was trying to keep in with her because she was about to be promoted.
2.
keep in with somebody
英語 "という言葉pozostawać z kimś w dobrych stosunkach"(keep in with somebody)集合で発生します。
UNIT 1 1.3 - LIFESTYLES (komunikacja)