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!

ō, ó, ǒ, ò

first tune

ō

oh (an exclamation) 喔 ō

second tune

ó

oh; ah 哦 ó

Chinese characters also pronunced ó

light tune

o

oh; ah 哦 ó

Chinese characters also pronunced ó