I sometimes see the idiom 不知不觉 used with this structure 在 + 不知不觉 + 中. Is there any difference? When should I use this pattern? Thanks :-)

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Answer

"不知不觉" is often used as "在 + 不知不觉 + 中". If you only say "不知不觉", it might be like an adv.. You can also think "不知不觉" as a situaiton (n.), so "在 + 不知不觉 + 中" means "in / within the situation of 不知不觉".
For example: "我不知不觉睡着了。"(adv.) & "在不知不觉中，我睡着了。"(n.).

Answer

Thank you very much for your detailed and clear explanation :-)

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