The function word 乃
In a sentence, the function word 乃 
is placed between a subject and a nominal predicate. It is used in written language.
is placed between a subject and a nominal predicate. It is used in written language.
Pay attention
A nominal predicate is a predicate expressed by a noun.
乃 emphasizes the predicate and strengthens its meaning.
Examples
《红楼梦》乃古代小说的杰出代表
"A Dream of Red Mansions" is a prominent representative of ancient novels
hónglóumèng nǎi gǔdài xiǎoshuō de jiéchū dàibiǎo
失败乃成功之母
Failure is the mother of success
shībài nǎi chénggōng zhī mǔ
工人乃新社会的主人
Workers are the masters of the new society
gōngrén nǎi xīn shèhuì de zhǔrén
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