a reward for good behaviour的用法和样例：
- He got a reward for helping them.
- She deserves a reward for her efforts.
- When you get offered a promotion, it's supposed to be a reward for good work. But in fact, most promotions derail you.
- Todd Darch, Kelseys father, says that getting his daughter a car means less driving for him as well as a reward for good grades and good behavior.