根据搜索结果，三年级英语上册第一单元的句子主要包括以下内容：

一、日常交际用语

问候与告别

- Hello! I’m Wu Yifan.

- Goodbye! / Bye, Miss White! / See you!

- Good morning! / Good afternoon!

- See you later. / Goodnight, Jane.

基本应答

- Yes, I am.

- No!

- Hi!

- This is my friend.

二、自我介绍与家庭

自我介绍

- My name’s Chen Jie.

- I have a pet dog named Max.

- I live in London.

家庭关系

- This is my father.

- This is my mother.

- I have two brothers.

三、兴趣爱好与日常活动

兴趣爱好

- I like to play football.

- I enjoy reading books.

- My favorite color is blue.

日常活动

- My family went on vacation last summer.

- I have a big collection of stamps.

- Today is a sunny day.

四、学校生活

学校相关

- I am in Class 3.

- My teacher is very kind.

- Let's make some cards for our classmates.

时间与天气

- It's 8 o'clock.

- The weather is sunny today.

五、行为请求与回应

请求许可

- May I come in？

- Can I have some water？

指令与回应

- Open the book.

- Close the window.

以上内容综合了教材中的典型句型结构，建议结合情景对话练习使用。若需具体练习题或发音指导，可参考配套练习册或在线资源。