in, on, at (place), as for, regarding
Noun +
Location or Time
When used with a noun, it marks the physical location or the time period of an event.
会議室
The meeting will be held in the conference room.
この法律は19世紀
This law was established in the 19th century.
Field or Situation
It can also mark a specific field, area of expertise, or abstract situation.
彼は医学の分野
He is very famous in the field of medicine.
Noun 1 +
Noun Modification
This structure connects two nouns to show that the second noun exists or occurs within the context of the first noun.
この会社に
The responsibility in this company is heavy.
将来に
Life in the future will change.