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不A而B for “B Happens Without A”

Use 不约而同 and 不翼而飞 to say a result happens even though the usual condition or action was missing.

รูปแบบประโยค

不 + A (the usual condition) + 而 + B (the result)

不A而B says B happens without A, the thing you would normally expect to come first; it is formal and appears mostly in set idioms.

听到这个好消息，同学们不约而同地欢呼起来。

When to use 不A而B for “B Happens Without A”

In 不A而B, A is something you would normally need, and B is the result. 而 links them like “and yet.” So 不约而同 is “not arrange (约) and yet do the same (同)”: people act the same way without planning it. 不翼而飞 is “have no wings and yet fly away”: something disappears and no one knows how.

我放在桌上的钥匙不翼而飞了，到处都找不到。

The keys I left on the table have vanished. I can’t find them anywhere.

世上没有不劳而获的事，想成功就得努力。

Nothing in life comes without work; if you want to succeed, you have to try hard.

老师一问，大家不约而同地举起了手。

As soon as the teacher asked, everyone raised their hands at the same moment.

讨论了两个小时也没有结果，会议最后不欢而散。

After two hours of discussion with no result, the meeting broke up on a sour note.

ข้อผิดพลาดที่พบบ่อย

  • Keep 而 in the third place: 不约而同, not 不约也同 or 不约不同.
  • Most 不A而B phrases are fixed idioms; don’t invent new ones from any verb.
  • 不翼而飞 means “vanish mysteriously,” not “really fly”; it is used for lost things, not birds.

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世上没有 的事，想成功就得努力

Nothing in life comes without work; if you want to succeed, you have to try hard
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