Subject + 未曾 + Verb
未曾 (wèicéng) means "never before" or "have not ever." It is a formal or literary negation indicating that something has not happened in the past, more emphatic than 没有, as in 未曾来过 (have never been to).
这种美景我未曾见过。
zhè zhǒng měijǐng wǒ wèicéng jiàn guò.
I have never seen such beautiful scenery.
他未曾提起自己的过去。
tā wèicéng tíqǐ zìjǐ de guòqù.
He has never mentioned his past.
我未曾想到会在这里遇见你。
wǒ wèicéng xiǎngdào huì zài zhèlǐ yùjiàn nǐ.
I never expected to run into you here.