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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lūn, lún, lǔn, lùn

second tune

lún

wheel take turns; alternate 輪 lún

wheel 輪子 lún zi
wheel 輪 lún	suffix 子 zi

alternate; by turns 輪流 lún liú
take turns; alternate 輪 lún	flow 流 liú

order; ethics moral relationship 倫 lún

ethics moral principles 倫理 lún lǐ
ethics 倫 lún	reason; logic 理 lǐ

Chinese characters also pronunced lún

fourth tune

lùn

discuss theory 論 lùn

discuss; discussion 討論 tǎo lùn
discussion 討 tǎo	discuss 論 lùn

theory; theorem hypothesis; supposition 理論 lǐ lùn
logic; reason 理 lǐ	theory 論 lùn