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不↖️ 一↗️ 定↖️ the symbol indicates four tones in Mandarin. If you have any problems with the four tones, just ask me in comment.


Yes, 4-2-4 is correct. According to the sandhi rule of 一 在四声前边要读二声 i.e. 一 should be pronounced in the 2nd tone before the 4th tone. And the sandhi rule of 不 “不”在一二三声前面不变调,读四声 i.e. 不 doesn't change the tone (the 4th tone) before the 1st/2nd/3rd tone. BTW: 2-2-4 sounds weird to me. Reference: 一字与不字的变调问题

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