during と while(〜の間) During or While?
前置詞 Prepositions
意味はほぼ同じ「〜の間」。違いは後ろに来るものだけです。during +名詞(during the meeting)、while +文(while we were talking)。品詞の問題であって、意味の問題ではありません。
They mean nearly the same thing — "in that span of time." The difference is purely what follows: during + noun (during the meeting), while + clause (while we were talking). It's a grammar-slot question, not a meaning question.
後ろに来るもので選ぶ
Choose by What Comes Next
during は前置詞なので、後ろは名詞のかたまり(the movie / my stay / lunch)。while は接続詞なので、後ろは主語+動詞の文です。「会議中に」なら during the meeting、「私たちが話している間に」なら while we were talking。言いたい内容がどちらの形か、だけ見れば選べます。
During is a preposition, so it takes a noun chunk: the movie, my stay, lunch. While is a conjunction, so it takes a subject and a verb. "During the meeting" — noun. "While we were talking" — clause. Look at the shape of what you want to say, and the choice makes itself.
同じ場面の言い換え One scene, two shapes
He fell asleep during the movie.
彼は映画の間に寝てしまった。
the movie という名詞 → during。 The movie is a noun — during.
He fell asleep while we were watching the movie.
私たちが映画を見ている間に、彼は寝てしまった。
主語+動詞の文 → while。同じ場面の言い換え。 Subject and verb — while. The same scene, reshaped.
during + 名詞
出来事・期間の名前を置く。 Name the event or the span.
No phones during class.
授業中はスマホ禁止。
while + 文
誰が何をしている間か、を文で言う。 Spell out who was doing what.
While you were out, someone called.
外出中に電話がありました。
よくある間違い Common Mistake
During I was sleeping, it started to rain.
私が寝ている間に、雨が降り出した。(のつもりで)
While I was sleeping, it started to rain.
私が寝ている間に、雨が降り出した。
during の後ろに文は置けません。文をつなぐのは接続詞の while です。逆に while +名詞だけ(while the meeting)も原則不可。ただし while in Paris(パリにいる間)のような、I was が省略された形には出会います。
During can't take a clause — that's while's job. The reverse holds too: "while the meeting" doesn't work. You will meet while + phrase — while in Paris — where "I was" has been politely dropped.
- during the day 日中は 「昼」という期間の箱を外から指す。 The daytime box, pointed at from outside.
- while you're at it ついでに 「それをしている間に(こっちも)」という依頼の定番。 "While you're doing that anyway…" — the classic add-on request.
- in the meantime その間に 「2つの出来事のあいだの時間に」。文頭で使う仲間の表現。 A cousin: the time between two events, usually opening a sentence.
- meanwhile いっぽうその頃 場面転換の副詞。物語・実況の道具。 The scene-cut adverb — storytelling's tool.
まとめ Summary
- during +名詞、while +文。意味はほぼ同じ。 During + noun; while + clause. The meaning barely changes.
- 同時進行の対比(〜する間、一方…)は while。 Side-by-side contrast is while's specialty.
- while in Paris 型の省略もある(I was が落ちた形)。 While + phrase exists too — with "I was" dropped.
- 迷ったら後ろの形を見る。それだけで決まる。 When unsure, look at what follows. That settles it.