What are the main or basic vowels in Pinyin?

The Basic Vowels: a, o, e, i, u, ü

Main Chinese Vowels in Pinyin
There are 6 main vowels in Pinyin which are: a, o, e, i, u, and ü. These 6 vowels are the most basic vowels that beginners need to learn from single-vowel Pinyin.

Let’s take a look at the table below.
SINGLE VOWEL PRONUNCIATION
a Pronounce with mouth wide open.
o Pronounce with making “O” shape mouth.
e Pronounce like you are smiling.
i Pronounce with biting your teeth.
u Pronounce with lips fully rounded.
ü Pronounced like the ü in German, or making the sound ‘shhhhh’.

Example
FINAL CHARACTER MEANING PRONUNCIATION AS IN ENGLISH PINYIN
a Mother Mother mā  
o Touch Modern mō  
e Hot Serve rè  
i One Insect yī  
u Five Wool wǔ  
ü Fish ü in German yú  

SINGLE VOWELS
ā   á   ǎ   à  
ō   ó   ǒ   ò  
ē   é   ě   è  
ī   í   ǐ   ì  
ū   ú   ǔ   ù  
ǖ   ǘ   ǚ   ǜ