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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huāi, huái, huǎi, huài

second tune

huái

bosom; embrace think; keep in mind 懷 huái

bosom; embrace 懷抱 huái bào
bosom; embrace 懷 huái	hold in the arms 抱 bào

yearn for; cherish the memory of 懷念 huái niàn
think 懷 huái	think of 念 niàn

ankle 踝 huái

ankle (the joint connecting the foot with the leg) 腳踝 jiǎo huái
foot; leg 腳 jiǎo	ankle 踝 huái

Chinese characters also pronunced huái

fourth tune

huài

bad; wicked broken; break down 壞 huài

bad girl 壞女孩 huài nǚ hái
bad; wicked 壞 huài	girl 女孩 nǚ hái

ruined; break down it's broken 壞掉了 huài diào le
ruined; break down 壞掉 huài diào	ending tag 了 le