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3.1 Syllables starting with "a", "o" or "e", just write down
final.
For example:
安 ān ( safe ), 鸥 ōu ( seagull ) 恩 en 恩 ( favor ), 昂 áng ( raise )
3.2 Syllables starting with "i", replace "i" with "y". For example:
严 yán ( strict ), 也 yě ( too )
Exceptions:
For
single vowel "i", and
nasals "in" and "ing", "y" is added before "i", resulting in "yi", "yin", and "ying";
Spell "you" for "iu", 有 yǒu ( have )
3.3 Syllables starting with "u", replace "u" with "w".
For example:
完 wán ( finish ), 外 wài ( outside )
王 wáng ( king ), 网 wǎng ( net )
Exceptions:
For
single vowel "u", "w" is added before "u", resulting in "wu";
Spell "wen" for "un";
Spell "wei" for "ui".
3.4 Syllables starting with "ü", replace "ü" with "yu".
For example:
雨 yǔ ( rain ), 孕 yùn ( pregnant )
园yuán ( circle ), 约 yuē ( appointment )
4. R-ending
The "er" (儿) sound can follow finals to form retroflection, add "r" at
end of
syllable in this case.
For example:
小孩儿 xiǎo hái er ( little kids )
雨点儿 yǔ diǎn er ( rain drops )
树枝儿 shù zhī er ( tree branch )
Again, it is good to know these rules to understand how to spell a character from Pinyin, but don't be intimidated by these Pinyin rules.
The more you practice,
more you will feel comfortable when speaking Chinese. You will eventually learn these rules without even realizing they exist, like most Chinese people do.

Rosie From Learn Chinese Language Online (http://www.learn-chinese-language-online.com)
The goal of Learn Chinese Language Online (LCLO) is to reduce the Mandarin Learning curve, promote and introduce the most efficient way to grasp the broad foundation of Chinese language.