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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to link more related multi-character Chinese words!

nān, nán, nǎn, nàn

second tune

nán

south 南 nán

man; male human male 男 nán

man; men grown man 男人 nán rén
man; male 男 nán	people 人 rén

difficult hard; not easy 難 nán

difficult; difficulty 困難 kùn nán
besieged 困 kùn	difficult 難 nán

Chinese characters also pronunced nán

third tune

nǎn

blushing; shamefaced 赧 nǎn

fourth tune

nàn

disaster; calamity 難 nàn

refugee; displaced person 難民 nàn mín
disaster 難 nàn	people 民 mín