当时 + Subject + Verb Phrase
The noun 当时 (dāngshí) means "at that time" or "then" and refers to a specific moment in the past that has already been established in context. It anchors a statement to a previously mentioned time frame, helping to set the scene for past events.
当时我还是个学生,什么都不懂。
Dāngshí wǒ hái shì ge xuéshēng, shénme dōu bù dǒng.
At that time I was still a student and didn't understand anything.
当时的情况非常紧急,没有时间多想。
Dāngshí de qíngkuàng fēicháng jǐnjí, méiyǒu shíjiān duō xiǎng.
The situation at that time was very urgent; there was no time to think.
她回忆说,当时街上一个人都没有。
Tā huíyì shuō, dāngshí jiē shàng yī ge rén dōu méiyǒu.
She recalled that at the time, there wasn't a single person on the street.