Subject + 愣 + 了
愣 (lèng) describes a state of being stunned, dazed, or momentarily frozen in surprise. It is used when someone is caught off guard and temporarily unable to react, as in 她愣了一下 (she was momentarily stunned).
听到这个消息,他愣了好几秒才反应过来。
Tīng dào zhège xiāoxi, tā lèng le hǎo jǐ miǎo cái fǎnyìng guòlái.
Upon hearing the news, he froze for several seconds before reacting.
她愣在那里,不知道该说什么。
Tā lèng zài nàlǐ, bù zhīdào gāi shuō shénme.
She stood there stunned, not knowing what to say.
我被他突然的表白愣住了。
Wǒ bèi tā tūrán de biǎobái lèng zhù le.
I was stunned by his sudden confession.