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
Click the framed calligraphic Chinese symbol icons
to link more related multi-character Chinese words!

nāi, nái, nǎi, nài

third tune

nǎi

thus; so; therefore 乃 nǎi

milk; breasts 奶 nǎi

butter 奶油 nǎi yóu
milk 奶 nǎi	oil 油 yóu

Chinese characters also pronunced nǎi

fourth tune

nài

but; how; what 奈 nài

cannot help it have no alternative have no choice 無奈 wú nài
without 無 wú	but; how 奈 nài

endure; bear; stand 耐 nài

patience 耐心 nài xīn
endure 耐 nài	heart 心 xīn

Chinese characters also pronunced nài