Explanation
Use "during" with a noun phrase. Use "for" with a length of time. Use "while" with a clause, so it needs a subject and a verb.
For example, "I listened to music during the train ride." Here, "during" comes before "the train ride," which is a noun phrase. It means the music happened in that period. In Japanese, one word like "〜の間" can cover all three ideas, so English needs a different word depending on what comes after it. If you say "for two hours," you are showing length. If you say "while I was studying," you are showing two actions happening at the same time.
「during」は名詞のかたまりの前に使います。「for」は時間の長さの前に使います。「while」は文の前に使い、その後に主語と動詞が必要です。
例えば "I listened to music during the train ride." では、"during" の後ろに名詞句 "the train ride" が来ています。これは「電車に乗っていたその時間に音楽を聞いた」という意味です。日本語では「〜の間」でまとめて言えてしまいますが、英語では後ろに来る形で使い分けます。"for two hours" は「2時間」という長さ、"while I was studying" は「勉強している間に別のことも同時に起きた」という感じです。
Examples
- I slept during the flight. 私は飛行機の中で寝ました。
- She worked here for three years. 彼女はここで3年間働きました。
- We talked while we ate lunch. 私たちは昼ごはんを食べながら話しました。
- Did you stay in Osaka for two nights? 大阪には2泊しましたか。
- He did not speak during the meeting. 彼は会議の間、話しませんでした。
- Please be quiet while the baby is sleeping. 赤ちゃんが寝ている間は静かにしてください。
Common Mistakes
Japanese learners often use "during" with a full clause, like "during I was cooking." That is wrong. Use "while" with a clause: "while I was cooking." They also mix up "for" and "during," like "I stayed in Kyoto during three days." Use "for" for duration: "I stayed in Kyoto for three days." Use "during" with a noun phrase: "during my stay" or "during the summer."
日本人学習者は、"during" の後ろに文を置いてしまうことがあります。例えば "during I was cooking" は誤りです。文を続けるときは "while I was cooking" を使います。また、継続時間に "during" を使って "I stayed in Kyoto during three days" としてしまうのもよくある間違いです。期間の長さには "for three days" を使います。"during" は "during my stay" や "during the summer" のように、名詞のかたまりと一緒に使います。