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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zuī, zuí, zuǐ, zuì

third tune

zuǐ

mouth 嘴 zuǐ

fourth tune

zuì

sin; crime; guilt 罪 zuì

drunk; intoxicated 醉 zuì

most 最 zuì

best had better (to do something) 最好 zuì hǎo
most 最 zuì	good 好 hǎo

Chinese characters also pronunced zuì