Are there any rules about the position of tone marks in Chinese Pinyin?

Answer 1

There are mainly three rules about the position of tone marks:

1) The tone marks should be put above a vowel if there is only one vowel in a syllable. For example: mā, pí, bà.

2) The tone mark should be put above the main vowel， if a syllable contains two or more vowels. For example: māo, mēi, kǒu.

3) The tone mark should be put above the latter vowel if a syllable contains a final "iu" or "ui." For example: diū, guī.

Answer 2

Yes, there are specific rules for the placement of tone marks in Chinese Pinyin. The tone mark always appears over a vowel and follows the order of: a, o, e, i, u, ü. If there are multiple vowels, the tone mark goes on the main vowel.