自分の部屋にいるんじゃない？ を英語で教えて!

Question

お母さんに弟がどこにいるのか聞かれたので、「自分の部屋にいるんじゃない？」と言いたいです。

Answer 1

・He might be in his room.
・I think he's in his room, isn't he?

1. He might be in his room
(彼は部屋にいるよ)

例文:
You: Mom, is he in his room?
あなた：お母さん。彼部屋にいる？
Mom: He might be in his room.
お母さん：自分の部屋にいるんじゃない

2. I think he's in his room, isn't he?
説明: この表現は、弟が自分の部屋にいると思われるが、確認のために尋ねている様子を表現しています。

例文:
Mom, I think he's in his room, isn't he?
お母さん、彼自分の部屋にいるよね？