打工用英语短语怎么说

In English, we generally use the phrase "work part-time" or "have a part-time job" to refer to working while also attending school or having another main commitment. We might also use the phrase "moonlighting" to refer to working a second job in addition to one's primary job. Here are a few phrases that you can use to talk about working part-time or having a second job:
"I'm working part-time at the grocery store while I finish my degree."
"I have a part-time job at the coffee shop on weekends."
"I'm moonlighting as a bartender on the weekends to earn some extra money."