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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sāi, sái, sǎi, sài

first tune

sāi

stuff; fill in; clogged up 塞 sāi

traffic jam 塞車 sāi chē
clogged up 塞 sāi	car 車 chē

cheek 腮 sāi

gill of fish 鰓 sāi

fourth tune

sài

race; contest; tournament 賽 sài

horse racing racing horse 賽馬 sài mǎ
race 賽 sài	horse 馬 mǎ