「Time flies」と言う表現は時間が早いすぎることを表す慣用句です。時間がどれほど早く過ぎたかに対する驚きや懐かしさを表す時によく使われます。

数年ぶりに会えた友達との出会いを想像してみましょう。学生のときの話から思い出し、誰か卒業から何年経ったのか急に気が着くべきです。そのとき、「Wow, time flies!」と言います。この文脈では学生の時から今までの時間が速く過ごしてしまったことに驚きを表す表現として使われた場合です。

例文

  1. It feels like just yesterday we were in high school, and now we're all adults. Time flies!
  2. I can't believe it's been five years since we moved to this city. Time flies when you're having fun.
  3. We've been married for 20 years already? Time flies when you're in love.
  4. I remember bringing my baby home from the hospital, and now they're starting school. Time flies.
  5. It's hard to believe our vacation is over already. Time flies when you're enjoying yourself.
  6. I was so focused on my work that I didn't notice how quickly time was flying by.
  7. When you're with good friends, hours feel like minutes. Time really flies.
  8. In the blink of an eye, our children have grown up and are ready to leave for college. Time flies, doesn't it?
  9. I've been so engrossed in this book that I didn't realize how much time had flown by.
  10. Looking back at old photographs, I'm reminded of how time flies and how much has changed.

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参考資料:

“Time Flies” Meaning and Examples
The expression “time flies” is an idiomatic phrase that means time passes quickly or seems to move rapidly.
Definition of TIME FLIES
—used to say that time passes quickly… See the full definition
time flies
1. used to mean that time passes surprisingly quickly: 2. used to mean that…