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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huān, huán, huǎn, huàn

first tune

huān

cheerful; joyous merry; happiness 歡 huān

happy; joyous 歡樂 huān lè
cheerful; joyous 歡 huān	joy; happiness 樂 lè

second tune

huán

ring; loop encircle; surround 環 huán

earrings 耳環 ěr huán
ear 耳 ěr	ring 環 huán

surround; encompass 環繞 huán rào
encircle; surround 環 huán	to circle 繞 rào

return; give back 還 huán

borrow and return 借,還 jiè huán
borrow 借 jiè	return 還 huán

Chinese characters also pronunced huán

third tune

huǎn

slow; unhurried postpone 緩 huǎn

slow; tardy 緩慢 huǎn màn
slow 緩 huǎn	slow 慢 màn

fourth tune

huàn

illusory; fantasy 幻 huàn

fantasy; pipe dream 幻想 huàn xiǎng
illusory; fantasy 幻 huàn	think 想 xiǎng

exchange; swap 換 huàn

interchange; exchange 交換 jiāo huàn
intersect 交 jiāo	exchange; swap 換 huàn

suffer from trouble; danger 患 huàn

fall ill; sickened 患病 huàn bìng
suffer from 患 huàn	illness 病 bìng

trouble for the future; evil consequences 禍患 huò huàn
disasters 禍 huò	trouble; danger 患 huàn

Chinese characters also pronunced huàn