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!

tuī, tuí, tuǐ, tuì

first tune

tuī

push 推 tuī

second tune

tuí

fall; ruined dejected; dispirited 頹 tuí

Chinese characters also pronunced tuí

third tune

tuǐ

leg 腿 tuǐ

fourth tune

tuì

withdraw; move backward return; refund; send back 退 tuì

Chinese characters also pronunced tuì