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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to link more related multi-character Chinese words!

wāi, wái, wǎi, wài

first tune

wāi

tilted; lopsided 歪 wāi

fourth tune

wài

outer; outside external; exterior 外 wài