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!

cāo, cáo, cǎo, cào

first tune

cāo

drill; exercise handle; manage 操 cāo

gymnastics; calisthenics 體操 tǐ cāo
body 體 tǐ	drill; exercise 操 cāo

Chinese characters also pronunced cāo

second tune

cáo

trough; manger tank; large storage chamber 槽 cáo

Chinese characters also pronunced cáo

third tune

cǎo

grass; straw 草 cǎo

Chinese characters also pronunced cǎo