It is precisely because… that… (正因为…才)

Structure 正因为 + emphasized cause，才 / 所以 + effect

正因为…才… (zhèng yīnwèi… cái…) strengthens the cause with 正 («precisely, exactly»): not just any reason, but that one and only that one produces the effect. The closing 才 stresses that the result holds only because of that cause: 正因为难，才更值得去做 = «precisely because it's hard, that's why it's all the more worth doing». Against plain 因为…所以… (HSK 2), 正 adds emphasis and contrast, often against what the listener would expect. It can also close with 所以 when 才's exclusivity nuance isn't needed.

Examples

正zhèng因yīn为wèi难nán，才cái更gèng值zhí得dé去qù做zuò。
Precisely because it's hard, that's why it's all the more worth doing.
正zhèng因yīn为wèi他tā诚chéng实shí，大dà家jiā才cái如rú此cǐ信xìn任rèn他tā。
It is precisely because he is honest that everyone trusts him so much.
正zhèng因yīn为wèi经jīng历lì过guò失shī败bài，所suǒ以yǐ他tā格gé外wài珍zhēn惜xī成chéng功gōng。
It is precisely because he has been through failure that he treasures success all the more.
正zhèng因yīn为wèi时shí间jiān紧jǐn迫pò，我wǒ们men才cái必bì须xū立lì刻kè行xíng动dòng。
It is precisely because time is pressing that we must act at once.

This point and the other 370, with audio on every example, inside Wanyu.

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