我曾去过北京。
Wǒ céng qùguò Běijīng.
I once went to Beijing.
她曾住在上海。
Tā céng zhù zài Shànghǎi.
She used to live in Shanghai.
曾先生来了。
Zēng xiānsheng lái le.
Mr. Zeng is here.
这是曾老师。
Zhè shì Zēng lǎoshī.
This is Teacher Zeng.
