に夢中です

be really into

→ に
phrase Rare #21,164
be really into に marks the person, thing, or activity someone is engrossed in. With an activity verb, use the dictionary form followed by のに夢中です.
JA: 妹は最近、料理に夢中です。
EN: My younger sister is really into cooking lately.

トムは、音楽に夢中です。

Tom is crazy about music.

トムは列車に夢中です。

Tom is fascinated by trains.

彼女は本に夢中です。

She is engrossed in the book.

あなたは今何に夢中ですか?

What are you really into right now?

まだテニスに夢中です。

I'm still crazy about tennis.

彼はゴルフに夢中です。

He's crazy about golf.

彼は音楽に夢中です。

He is crazy about music.

私は帆走に夢中です。

I'm passionate about sailing.

弟は切手を集めるのに夢中です。

My younger brother is really into collecting stamps.

ジムは彼のガールフレンドに夢中です。

Jim is crazy about his girlfriend.