1. You are a good student.

2. You are not alone!

3. You are at my house.

4. You are at the park.

5. You are pretty.

6. You are my sunshine.

7. You are welcome.

8. You are not.

这些句子分别表达了不同的意思，例如描述一个人的身份、情感状态、位置等。希望这些例子能帮助你理解"you"和"are"在句子中的用法。