Basic Chinese Pinyin Rules
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Talking about Chinese Pinyin rules, let's start by looking at the following different scenarios:
1. Tone Mark Placement
The tone mark is placed over the vowel if there is only one vowel, e.g. wo, or on the main vowel of a syllable where they are two or three vowels, e.g. hao.
1.1 Syllable with one vowel letter, tone mark is always placed over the vowel letter. For examples:
笔 bǐ ( pen ) , 山 shān ( mountain )
车 chē ( car ), 信 x