根据2021年八年级英语教材内容，第一单元重点句子主要围绕日常交流展开，以下为典型例句整理：

一、基础问候与自我介绍

1. What's your name？ - My name is [name].

2. How old are you？ - I'm [age] years old.

3. Where are you from？ - I'm from [place].

4. Nice to meet you. - Nice to meet you too.

二、兴趣爱好与日常活动

5. What do you like doing？ - I like [hobby1][hobby2].

6. My favorite subject is [subject].

7. How often do you exercise？ - I exercise [frequency] every day.

8. I spend at least [time] in the gym every day.

三、行为习惯与能力

9. I usually get up at [time].

10. How do you go to school？ - I [mode of transportation].

11. Can you speak English？ - Yes, I can.

12. I'm good at [skill].

四、喜好与比较

13. Which sport do you prefer？ - I prefer [sport1] to [sport2].

14. I like [sport] better than [other sport].

15. What's your favorite food？ - My favorite food is [food].

五、特殊场景表达

16. Excuse me, where is the library？

17. I'm sorry, I'm late.

18. Thank you for your help.

以上句子覆盖了教材中常见的交际场景，建议结合实际对话练习使用。如需更详细的短语搭配，可参考教材配套练习册。