a grown-up person的用法和样例：
- She could pass for thirty but I happen to know she's got a grown up son.
- The child behaved like a grown up.
- Don't mother her, she is a grown up already.
- A troublesome situation has grown up.
- His son has grown up into a sturdy hardworking young man.
- Deepak：as a child u have to depend on unreliable source for answers.but as a grown up u can try to find ur self rather than depeding on somebody.