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!

nū, nú, nǔ, nù

second tune

nú

slave 奴 nú

master and slave 主,奴 zhǔ nú
master; host 主 zhǔ	slave 奴 nú

Chinese characters also pronunced nú

third tune

nǔ

strive; endeavor work hard; exert oneself 努 nǔ

efforts; great efforts strive; make great efforts 努力 nǔ lì
strive; endeavor 努 nǔ	force 力 lì

Chinese characters also pronunced nǔ

fourth tune

nù

anger; angry fury; rage 怒 nù

rage; fury; wrath flames of anger 怒火 nù huǒ
anger; rage 怒 nù	fure 火 huǒ