I know that plosive consonants can change in natural Mandarin speech, like intervocalic g is almost always elided, and sometimes k, but b and p are almost never elided, but when should d be elided?

I found this example of 知道 as zhao/zao, (https://chinesehacks.com/vocabulary/syllable-contractions/),but I'm trying to focus on Beijing Mandarin instead of Taiwanese so I didn't think much of it. However, I then found this page on the Beijing dialect which had the same change (https://pinyin.sogou.com/zimeiti/article/1255).

The often cited example is that 知道 changes to rdao in 不知道 for Beijing speakers, but when should d disappear and remain then? Is it something about dao being unstressed in 知道 but stressed in 不知道? Is it about the combination of zh+d? or i+d?

Any insight would be appreciated.

  • 1
    (Disclaimer: beginner here). Isn't the first example (zhi dao > zhao) specific to Taiwanese Mandarin and the second example (buzhidao > buRdao) specific to Beijing Mandarin; and those are two different dialects so we can't derive a rule from these examples?
    – 范阮煌
    Apr 11, 2020 at 14:43
  • 1
    @范阮煌 The "zhao/zao" example is found in both articles for Taiwan and Beijing dialects
    – dinolingo
    Apr 11, 2020 at 20:15
  • 1
    I don't think it is regular. It just depends on how fast you say, for 'bu zhi dao' is als pronounced as 'burao' in Beijing dialect sometimes.
    – Alsein
    May 7, 2020 at 8:27
  • 1
    I'm afraid 知道 as zhao/zao may not be a suitable example for Beijing Mandarin, (just in my experience), the pronunciation of 知道 as zhao/zao (for Beijing Mandarin) just occurs in the recent ten years beginning as a network slang. It has accepted by young people widely, but may have no relevance about the pronounciation rules. (just in my experience :-)
    – XQY
    Jul 20, 2020 at 2:17


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