“Before you go, can you take a quick look at this email I'm sending to Tracy?”
You're writing an email to tell your cousin that you can't come to her graduation ceremony. You want to make sure that your email sounds sorry, but not too dramatic. Your boyfriend is leaving for work, but you ask him to check the email.
Before you go, can you take a quick look at this email I'm sending to Tracy?
The word "look" is very general. It can mean to look for a long time, a short time, carefully, absent-mindedly, or in many other ways. "Take a look" is more specific. It means to look at something for a short period, usually for a specific purpose.
You can ask someone to take a look at something that needs to be fixed, or for something that's important for them to see. Here's another example from a science classroom. The teacher tells the class to look at something in the textbook:
Use the phrase "before you go" when someone is about to leave, but you want them to do something first.
Before you go, can we talk for a few minutes?
You can put "before you go" at the beginning of a sentence or the end.
Hey, can you take out the trash before you go?