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!

kuī, kuí, kuǐ, kuì

first tune

kuī

loss; deficit 虧 kuī

suffer losses disadvantage; unfavorable situation 吃虧 chī kuī
eat 吃 chī	loss; deficit 虧 kuī

helmet 盔 kuī

suit of armor helmet and armor 盔甲 kuī jiǎ
helmet 盔 kuī	armor 甲 jiǎ

Chinese characters also pronunced kuī

second tune

kuí

helianthus 葵 kuí

sunflower 向日葵 xiàng rì kuí
toward 向 xiàng	sun 日 rì	helianthus 葵 kuí

Chinese characters also pronunced kuí

third tune

kuǐ

puppet 傀 kuǐ

puppet 傀儡 kuǐ lěi
puppet 傀 kuǐ	puppet 儡 lěi

Chinese characters also pronunced kuǐ

fourth tune

kuì

conscience-stricken ashamed; shameful 愧 kuì

feel ashamed embarrassed and guilty 慚愧 cán kuì
feel ashamed 慚 cán	conscience-stricken 愧 kuì

deficient 匱 kuì

deficient; deficiency short of supplies 匱乏 kuì fá
deficient 匱 kuì	lack 乏 fá

break down routed; dispersed 潰 kuì

collapse nervous breakdown 崩潰 bēng kuì
collapse 崩 bēng	break down 潰 kuì

Chinese characters also pronunced kuì