The following video demonstrates each syllable of the pinyin structure
and the exercise of pinyin/zhuyin with basic Chinese 4-tune pronunciation

Mandarin pinyin tunes
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ā, á, ǎ, à

first tune

ā

initial particle for name or person 阿 ā

aunt; auntie 阿姨 ā yí
initial particle 阿 ā	aunt; woman 姨 yí

Chinese characters also pronunced ā

light tune

a

ah; oh 啊 a

God! (My Heaven!) 天啊 tiān a
heaven; sky 天 tiān	ah; oh 啊 a

My goodness; Oh my God 我的天啊 Wǒ de tiān a
my 我的 wǒ de	heaven; sky 天 tiān	ah; oh 啊 a