`but` 是一个常用的英语单词，它可以用作连词、介词、副词和名词。以下是使用 `but` 的一些句子示例：

### 连词 （conjunction）

- **转折关系：**

- I like apples, but I don't like oranges.

- He is a good boy, but he sometimes gets into trouble.

- **让步关系：**

- Although he is tired, he still works hard.

- Despite the heavy rain, they decided to continue their hike.

- **对比关系：**

- I wanted to buy a red shirt, but I chose blue instead.

- He is young, but he is very wise.

### 介词 （preposition）

- **除了：**

- I have no choice but to accept the offer.

- We have tried everything but it still didn't work.

### 副词 （adverb）

- **仅仅：**

- I can't do it, but you might.

- He is not very tall, but he is very strong.

### 名词 （noun）

- **借口：**

- He didn't finish his work, but he had a valid excuse.

- **原因：**

- The game was canceled, but the team was still happy.

这些句子展示了 `but` 在不同句子结构中的用法，包括表示转折、让步、对比、除了、仅仅和原因等。使用 `but` 时，通常是为了引出与前面内容相对立或不同的信息