✨ ベストアンサー ✨
whichの直前に前置詞があればいいってことですか? → その通り!
①whichを使う場合:I met her on the day. + It was snowing on it(代名詞・目的格=the day).
→ I met her on the day on which(関係代名詞・目的格) it was snowing.
②whenを使う場合:I met her on the day. + It was snowing then(副詞=on the day).
→ I met her on the day when it was snowing.
参考にしてください。
You're welcome!😊
理解しました!ありがとうございます!