下川

下川

Shimokawa (a Japanese surname or place name meaning "lower river").

In this sentence, 下川 is being used as a proper noun to denote a place name.

下川に住んでいます。

I live in Shimokawa.

Here, 下川 is used as part of a person's name, likely a teacher's name.

下川先生は優しいです。

Mr. Shimokawa is kind.

In this sentence, 下川 is divided into 下 (below) and 川 (river), describing a location under the river.

川の下で泳ぐのが好きです。

I like swimming under the river.