语法总结
needn't 与 needn't have done
You needn't be rude 表示现在不必；You needn't have said that 表示过去本来不必说却说了。
相似句：
- You needn't wait.
- You needn't have bought it.
定语从句修饰名词
things we don't need 和 a hat that looked like... 都把从句放在名词后作修饰。
相似句：
- This is the book I need.
- She wore a dress that looked unusual.