中文里基本的声调有5种，大家还记得吗？
Do you still remember the five tones in Chinese?
那么今天需要给大家分享的是关于声调中变调的部分，尤其是非常常见的“一”和“不”的变调。
So today, I'll share the tonal modification part of tones, especially about "yi" and "bu".
“一”的变调 the modification of "yi"
yi 第四声：yi 会读作第二声 yí, 比如 for example：,
yi the fourth tone will be changed to the second tone, that is
yi 第一，二，三 声：yi 会读作第四声 yì, 比如 for example：,
yi the first/second/third tone will be changed to the fourth tone, that is yì
但是，当 “一”表示序列的时候，声调是第一声。
However, when "yi" means the order of something, the tone should be the first one, yī
比如：第一， 一楼
for example : dì yī (Firstly) yī lóu (the first floor)
当“一”在重叠字中间的时候读轻声, 比如：
When "yi" is put in the middle of two same characters, the tone is neutral, for example:
“不 bù”的变调 the modification of bù
当bù 在第四声前面时，会变成第二声, 比如：
When bù is put before the fourth tone, it will change to the second tone, for example:
当“不”在重叠字中间的时候读轻声，比如：
When bu is in the middle of two same characters, it is a nuetral tone.
