が怖いの

are you afraid of …?

→ が
phrase Common #6,163
are you afraid of …? A casual question pattern; の gives the question an explanatory or confirming tone.
JA: 高いところが怖いの?
EN: Are you afraid of heights?

ヘビが怖いの?

Are you afraid of snakes?

犬が怖いの?

Are you afraid of dogs?

まだ暗いところが怖いの?

Are you still afraid of the dark?

私が怖いの?

Are you afraid of me?

— オープン・ユア・アイズ (1997)

伯爵の何が怖いの?

What's so scary about the count?

— お嬢さん (2016)

オオカミが怖いのよ。

Wolves scare me.

何が怖いの?

What are you afraid of?

爆弾が怖いの!

I'm scared of bombs!

— ラスト、コーション (2007)

彼は、飛行機で飛ぶことが怖いのです。

He’s afraid of flying.

それが怖いのね

That scares you, huh?

— ワン・バトル・アフター・アナザー (2025)

ネズミが怖いの?

Are you afraid of mice?

真剣な会話が怖いの?

Are you afraid of having serious conversations?

— 甘い生活 (1960)

トムは犬が怖いの?

Is Tom afraid of dogs?

どうして犬が怖いの?

Why are you afraid of dogs?

今でもヘビが怖いの?

Are you still afraid of snakes?

虫が怖いの?

Are you afraid of bugs?

正直に言うと、トムのことが怖いの。

To be honest, Tom scares me.

トムはこれが怖いの?

Is Tom scared of this?

一人が怖いの?

Are you afraid to be alone?

メリーは犬が怖いのよ。

Mary is afraid of dogs.