Rules of the Pinyin (phonetics) <4>

Rules of the Pinyin (phonetics)
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  1. Generally speaking, each Chinese character has only one tone but there are a few exceptions.

    A frequently used word “一” (meaning “One”) has three tones:

A.

When “一” is used independently it pronounces as “yī” (the first tone).

For example:

之一 --- zhī yī (meaning “one of”)

第一 --- dì yī (meaning “first”)

B.

When it is followed by a word with the first, second or third tone, it pronounces as “yì” (the fourth tone).

For example:

一些 –- yì-xiē (meaning “some”)

一年 –- yì-nián (meaning “one year”)

一起 –- yì-qǐ (meaning “together”)

C.

when it is followed by a word with the fourth tone, it pronounces as “yí” (the second tone).

For example:

一个 – yí-gè (meaning “a”)