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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lü, lǘ, lǚ, lǜ

second tune

lǘ

donkey ass; jackass 驢 lǘ

donkey 驢子 lǘ zi
donkey 驢 lǘ	suffix 子 zi

Chinese characters also pronunced lǘ

third tune

lǚ

mate; companion 侶 lǚ

companion intimate partner 伴侶 bàn lǚ
accompany 伴 bàn	companion 侶 lǚ

aluminium (metal) 鋁 lǚ

travel; journey 旅 lǚ

journey; travel 旅行 lǚ xíng
travel 旅 lǚ	go; walk 行 xíng

Chinese characters also pronunced lǚ

fourth tune

lǜ

green 綠 lǜ

green tea 綠茶 lǜ chá
green 綠 lǜ	tea 茶 chá

law; rule 律 lǜ

laws legislation; enactments 法律 fǎ lǜ
law 法 fǎ	law; rule 律 lǜ

rate; proportion 率 lǜ

efficiency 效率 xiào lǜ
effect 效 xiào	rate 率 lǜ

consider; concern ponder; think over 慮 lǜ

consider think it through take account of 考慮 kǎo lǜ
check 考 kǎo	consider; think over 慮 lǜ

anxiety feeling of worry, nervousness about uncertain outcome 焦慮 jiāo lǜ
restless 焦 jiāo	concern 慮 lǜ

Chinese characters also pronunced lǜ