Here's why:
* "Before homework" is a common phrase used to describe something that happens before doing homework, like "I like to play video games before homework."
* "A before homework" doesn't make sense grammatically. We need to clarify what the "a" refers to. For example, "I need a break before homework" makes sense.
Can you tell me more about what you're trying to say? I can help you figure out the correct way to phrase it. 😊