G2P 变调

[zh794390558]

https://en.wikipedia.org/wiki/Standard_Chinese_phonology#Tone_sandhi
https://github.com/Kyubyong/g2pC/blob/master/g2pc/g2pc.py#L84
mozillazg/python-pinyin#133
https://zh.wikipedia.org/wiki/%E8%AE%8A%E8%AA%BF

三声变调
最普通的变调规则即是在一组两个上声（第三声）的合音节中，须将合音节中领先的第一个音节提升到阳平（第二声）。
举例来说，你好（nǐ hǎo）为最普通的中文问候语，nǐ与hǎo原调都是上声，不过合音节第三声的“你”须读为调值略低的阳平（实际为上声的后半段，但听感与阳平几乎一致）即“你好”要念为“ní hǎo”。

1. 两个三声：
  When there are two Third Tones together, the first one changes into the Second Tone.
2. 三个三声
  ABC：  three number "nine" are equally put together, the first two syllables both change into the Second Tone.
（AB)+C：(syllable A + B) is a word, and it modifies syllable C. Both (syllable A + B) change into the Second Tone.
  A+(BC):   syllable A is a word, and it modifies (syllable B + C). Only syllable B changes into the Second Tone. Also, syllable A in this situation is actually pronounced in the Half Third Tone
3. half third tone
When Chinese Pinyin Third Tone goes before the First, the Second or the Fourth Tone
So when we have a 3-syllable word. With the Tones like below, the syllable marked in red and underlined is pronounced as Half Third Tone.
nǎ gēn nǎ ——> Half 3rd + 1st + Full 3rd
gēn nǎ -> 1st + Full 3rd

三声变调：最大匹配三声序列，分两个或者三个三声。
三个三声：找到后可以分词，然后应用规则。
是否要加入半三声？


两个四声
第一个四声变成半四声。


轻声
They are 2-syllable words with both syllables made of the same characters. 
In each word, the first character is pronounced in its original Tone 
while the second character is pronounced in the Neutral Tone.
爸爸，妈妈，哥哥，他的，好吧，要不，孩子，东西，钉子，脑子

The Third Tone in Front of The Neutral Tone
No.1 When the original Tone of the Neutral-tone syllable is the Third Tone, the Third Tone in front of it becomes the Second Tone; 
No.2 When the Neutral-tone syllable is originally in the First, the Second or the Fourth Tone, the Third Tone in front of it is pronounced in the Half Third Tone.


一不变调
当“一”和“不”夹在词语中间念轻声，例如“看一看”、“好不好”等等。

“一”的变调
“一”的原调是第一声。
当“一”在表示数目时，以及在词尾出现时，念为原调。例如︰一二三四、第一等等。
当“一”与量词配搭时，如量词的声调是第一声、第二声或第三声，“一”念成第四声，例如“一根”、“一钱”和“一种”。
如果量词的声调是第四声，“一”念成第二声，例如“一寸”。
(1) When 一 is by itself, meaning "the mathematical number one", it is pronounced in the First Tone "yī".
(2) When Character Yi 一 goes before the First, the Second and the Third Tone, it is pronounced in the Fourth Tone "yì"; 
(3) When Character Yi 一 goes before the Fourth Tone, it is pronounced in the Second Tone "yí".

“不”的变调
“不”的原调是第四声。
当“不”后面跟着第一声、第二声和第三声的字，或者“不”出现在词末，念为原调。例如︰“不高”、“不祥”、“不好”和“我就不”。  
当“不”后面的字是第四声，念为第二声，例如“不要”。

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