Dictionaries, in general, will not incorporate tone sandhi rules into their pronunciations (of which Mandarin has quite a few)
Wikipedia says the following:
Mandarin features several sandhi tone rules.
When there are two 3rd tones in a row, the first one becomes 2nd tone,
and the second one becomes a half-3rd tone. E.g. 你好 (nǐ + hǎo = ní
The correct one should be bu2 zai4 hu. Unless there is an emphasis for "NOT" CARE, a 4th tone bu4 is then used, but I rarely hear that as a native speaker.
Let's review the tone change rule for 不，
A second tone bu2 is used only when the tone of next character is a 4th tone, i.e. bu2 shi4.
A forth tone bu4 is used if the tone of next character is 1st, 2nd ...
There have been conflicting claims on whether the second tone and the "raised third tone" are distinct, but according to Jerry Norman's 1988 book, Chinese, "Perceptual tests done by Dreher and Lee (1966) and Wang and Li (1967) established that native speakers are unable to make a consistent distinction between second tones and raised third tones" (147). So ...
Modern Cantonese is generally considered not to have tone sandhi (in Chinese, 變調, but also more specifically 連續變調), that is to say, changes in the tonal values when in certain phonetic contexts.
Cantonese does have a phenomenon of lexical derivation which involves a change of tone, known as 變音 or changed tone; many discussions consider both these tone ...
Simply put, there are no tone sandhi rules for when words change from their citation tone to the neutral tone. The appearance of the neutral tone is morphologically motivated, not phonologically motivated — in other words, the tone change is not governed by the sounds of the surrounding words. Because the definition of sandhi is phonologically-...
Zhang and Yang (2007:97) has an interesting remark on consecutive neutral tones within certain three-character words (三字組詞):
(Translation) Should both of the latter two syllables within a three-character word possess the neutral tone, then the pitch of the neutral tone in ...
"bao3 bao0" is actually not a third tone sandhi here.
It is because the tone of second bao3 got neutralized.
Usually a second character of a two-character word would get neutralized, I would say it is a accent thing that depends on people from different places of China.
That depends on why you are writing it. The standard, normal way of writing it is to disregard the changed tone and write the original tone, i.e. bù kèqi. The same goes for tone changes of 一 (yī). Not showing the tone change is not a problem in this context, because the rules governing how to change the tones are quite simple. Since most Pinyin is written ...
This rule is not so strict, as in my specification, we never pronounce 甲苯（methylbenzene）,乙苯(ethylbenzene), 苯甲酸(acetic acid) in that fashion, though no ambiguity is produced, it is just weird and funny to pronounce so.
However, for familiar words like 奶奶，姐姐, the other extreme is present, which is they are always pronounced as 21-5. (In my opinion, this is an ...
The classic sentence for multiple tone 3s is “Old Li buys good wine.”
老 李 買 好 酒
In citation form they are all tone 3s, of course:
lao3 Li3 mai3 hao3 jiu3
Which ones change to tone 2? It basically depends on how fast you are speaking. If you are speaking slowly and carefully, only the tones that are within a phrase will ...
The rule of thumb is the following.
When indexing it is yi1. For example
一楼 (first floor)
一声 (first tone)
第一 (the first)
一次世界大战 (World War I)
When counting （the same rule as 不）
it is yi4 when followed by 1, 2, 3 tone
it is yi2 when followed by 4 tone
For others, mostly yi1. For example
As a ...
No, this is not standard Pinyin, if this form of tone sandhi is written out. The author is simply trying to convey what it would look like if written out (instead of retranscribing it with Chao-style tone letters).
This type of sandhi ("Mandarin T2 Sandhi", for Tone 2 Sandhi), is mentioned only rarely, because it is a "prosodic-driven process", i.e. it ...
From Chinese Wiki:
The Pinyin for 蒙古 is written like this in ABC:
Notice the dot under the letter E, this is an indicator that this word is read with tone sandhi. The tone sandhi rules dictate that meng3 gu3 be read:
meng2 gu3 (méng gǔ)
Another factor that may add to your confusion is the fact that the standard pronunciation in Taiwanese Mandarin is different. For ...
Tone Sandi rule should merely apply to spoken. In written, you should always put original tones in any forms of exams except that those exams are testing the rule itself.
In fact, I doubt most of natives are aware of the existence of Tone Sandi indeed. But they do apply the rule naturally in practice. I suggest you study by phrase, not by character. That ...
The Chinese pinyin system includes three parts: shengmu (initial), yunmu (final), and shenɡdiào (tones), and the tones in Mandarin are very important. Even if the initial and final are the same but have a different tone, the meaning will be different. So if you really want to master this language, you must learn to make each tone very clearly, otherwise you ...
as in the typical tonal sandhi of two consecutive 3rd tones, like 老板 (lao2ban3).
However I wouldn't outright exclude your first suggestion deng2deng0, as it might be pronounced like that in fast speech, or in the middle of a sentence.
This is a difficult problem to address, because 等等 apparently fits one of the criteria for neutral tone, but at the same time there is tone sandhi for two conjoint third-tone words. The following attempts to resolve the conflict between the two rules:
The pronunciation of 33 words
In my explanation below, I use 1 through 4 to indicate the first to fourth ...
Standard practice is not to change the tone diacritics to represent tone sandhi. So bù shì keeps the fourth tone on bù in spite of the pronunciation as bú shì. The same applies to the tones on 一 / yī, even though some learners dictionaries diverge from this rule. The rule also applies to third-tone sandhi.
See for example Tone change rules in the Chinese ...
For purposes of "tonality," Chinese doesn't want to have two words with the fourth tone or third tone "back to back." When this happens, the first word in the series takes the second tone instead.
The example of using two words with fourth tones such as 不在 is one where the two words together are pronounced bu2zai4, even though they are pronounced 不bu4 and ...
(This was originally a part of my answer on another question concerning tone sandhi AND neutral tones. I feel my explanation below on just tone sandhi befits here more. Consider this a slight extension to the accepted answer.)
The pronunciation of words consisting of more than two adjacent third-tone characters depends on correct parsing.
E.g. 1 老/總統 333 >...
The obligate tone sandhi for consecutive third-tones are rendered as follows:
In particular, the 333 -> 223 change in 很有品味 is explained here.
Possible facultative tone sandhi in 很有 in quick speech include:
For all 很有XX examples: blurring of tones (quasi-neutral, as explained here; to ...