四年级英语第一单元的课文句子因教材版本不同有所差异，以下是综合多个版本整理出的重点句子分类：

一、基础问候与日常交流

问候类

- Hello! How are you？

- Good morning/afternoon!

- It's nice to meet you.

自我介绍

- My name is...

- I'm [age] years old.

- I'm from [country].

位置询问

- Where is the...？

- It's on the first/second floor.

- It's near the window.

二、学校环境与设施

教室相关

- This is our new classroom.

- Let's go and see!

- The wall is white.

学校设施

- Where is the library？

- Do you have a computer room？

三、兴趣爱好与行为习惯

爱好询问

- What's your hobby？

- I like... （e.g., painting, collecting）

行为描述

- It's time to get up.

- Let's clean the classroom.

四、颜色、天气与时间

颜色描述

- What colour is this？

- My favorite color is...

天气询问

- What's the weather like？

- Is it sunny？

时间相关

- What time is it？

- I go to school at...

五、一般疑问句与回答

一般疑问句：

Do you like...？

Is this...？

How many...？

回答结构：

Yes, it is. / No, it isn't.

It's...

以上句子覆盖了四年级英语第一单元的核心语法点，包括一般疑问句、陈述句、方位介词等，建议结合具体教材配套练习巩固学习。