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!

zāi, zái, zǎi, zài

first tune

zāi

disaster; calamity 災 zāi

plant; grow 栽 zāi

plant and cultivate cultivate and nourish prepare a person's career 栽培 zāi péi
plant; grow 栽 zāi	cultivate 培 péi

Chinese characters also pronunced zāi

third tune

zǎi

son; whelp 仔 zǎi

cowboy 牛仔 niú zǎi
cow 牛 niú	son 仔 zǎi

butcher; slaughter rule; govern; preside 宰 zǎi

Chinese characters also pronunced zǎi

fourth tune

zài

at; in; on exist; present 在 zài

exist; existence 存在 cún zài
keep; retain 存 cún	exist; present 在 zài

again; furthermore 再 zài

Goodbye See you again 再見 zài jiàn
again 再 zài	see 見 jiàn

load; carry offer a ride 載 zài

freight; load goods; carry cargo 載貨 zài huò
load; carry 載 zài	goods; cargoes 貨 huò