| 1. |
"1" is pronounced in its original tone, i.e., the first tone when it: |
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(i) stands alone;
(ii) refers to a sequence;
(ii) is the last word of a phrase;
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「一」字单念、用作序数，或处于词句末尾时，读本调（即第一声）。 |
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Examples 例子: |
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一楼 |
第一 |
唯一 |
一加一 |
(the 1st floor) |
(the 1st) |
(the only one) |
(one plus one) |
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| 2. |
When "bu" or "yi" appears before a syllable of the 4th tone, it is pronounced as a 2nd tone.
「不」或「一」出现在第四声前时，读作第二声。
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Examples 例子: |
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不变 |
－－＞ |
不变 |
(unchanged) |
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一定 |
－－＞ |
一定 |
(certainly) |
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| 3. |
When "bu" or "yi" appears before a syllable of any other tones, it is pronounced as a 4th tone.
「 不」或「一」出现在其他声调的音节前时，都读第四声。
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Examples 例子: |
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一天 |
－－＞ |
一天 |
(one day) |
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一同 |
－－＞ |
一同 |
(together) |
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一本 |
－－＞ |
一本 |
(a copy) |
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不单 |
不和 |
不好 |
(not only) |
(in conflict) |
(not good) |
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| 4. |
In some special cases, "yi" and "bu" are pronounced as a neutral tone. Neutral tone is much shorter than a normal tone and is identified by the absence of a tone mark.
「一」和「不」在某种特殊情况下读轻声。轻声的音长比重读短得多，而且不标调号。
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