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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kūn, kún, kǔn, kùn

first tune

kūn

group; numerous 昆 kūn

insect 昆蟲 kūn chóng
group; numerous 昆 kūn	bug 蟲 chóng

female; feminine Earth (opposite to Heaven) 坤 kūn

Heaven and Earth (I-Ching) 乾坤 qián kūn
male; Heaven 乾 qián	female; Earth 坤 kūn

Chinese characters also pronunced kūn

third tune

kǔn

tie with string or cord bind; bundle up 捆 kǔn

bundle; bunch tie up; bundle up 綑 kǔn

Chinese characters also pronunced kǔn

fourth tune

kùn

stranded; trapped; besieged 困 kùn

difficult; difficulty 困難 kùn nán
stranded; trapped 困 kùn	difficult 難 nán

sleepy; feel sleepy doze off 睏 kùn

I am sleepy 我好睏 wǒ hǎo kùn
I 我 wǒ	quite; very 好 hǎo	sleepy 睏 kùn