Structure:

Subject + Time + 就 + Verb + Object

Meaning:

Just as 才 can express lateness, 就 (jiù) can be used to indicate that something happened earlier than expected.

Examples:

    她 十八 岁 就 大学 毕业 了。

    Tā shí bā suì jiù dà xué bì yè le

    She graduated from college when she was only 18 years old.