In Chinese pinyin, the most popular Romanisation style (now that the Wade Giles [link] system has been shown to be less helpful to Westerners learning the language) has six vowels, though each vowel has five potential ways of being written depending on the tone of the syllable and the positioning of the vowel itself.

Table of Chinese Pinyin Vowels

a	á	ā	à	ă
e	é	ē	è	ě
i	í	ī	ì	Ǐ
o	ó	ō	ò	Ǒ
u	ú	ū	ù	Ǔ
ü	ǘ	ǖ	ǜ	Ǚ

I have included a table below because of the difficulty I have had initially finding these written down. I hope they will be of use to you as well when writing Chinese Mandarin in the pinyin form.

I will write here much more about tones and syllable structure in Mandarin as time goes on, and interlink the posts.
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