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1. Who is the teacher <[with] whom you were talking in front of the teacher's room>? ← you were talking [with] him/her
<あなたが講師室の前で一緒に話をしていた>先生は誰ですか?
2. The hotel <[at] which I stayed> was very bad. ← I stayed [at] the hotel
<私が泊まった>ホテルは非常にひどかった。
3. He is the boy <[with] whom I had lunch yesterday. ← I had lunch [with] the boy
彼は<昨日私が一緒に昼食をとった>少年です。
4. The restaurant <[to] which we went yesterday> served very good food. ← we went [to] the restaurant
<私達が昨日行った>レストランは、とても美味しい食事を出しました。

参考にしてください。

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