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1. The sun rises in the east and sets in the west. 太阳从东方升起,在西方落下。

2. She is reading a book while I am writing an essay. 她正在看书,而我则在写论文。

3. He plays basketball every day, but she prefers swimming. 他每天都打篮球,但她更喜欢游泳。

4. We should respect our elders and help those in need. 我们应该尊重长辈,并帮助有需要的人。

5. The cat is chasing the mouse around the house. 猫正在房子里追着老鼠跑。

6. They are discussing their plans for the weekend. 他们正在讨论周末的计划。

7. The teacher is explaining the lesson to the students. 老师在给学生们讲解课程内容。

8. She is cooking dinner while he is washing dishes. 她正在做饭,而他则在洗盘子。

9. The birds are singing in the trees. 鸟儿们在树上唱歌。

10. He is running on the treadmill while she is lifting weights. 他在跑步机上跑步,而她则在举重。

11. The children are playing outside in the park. 孩子们正在公园外面玩耍。

12. She is knitting a sweater while watching TV. 她在看电视的同时织毛衣。

13. The dog is barking at the mailman. 狗对着邮递员叫。

14. They are having a picnic in the park. 他们在公园野餐。

15. The storm is bringing heavy rain and strong winds. 暴风雨带来了大雨和大风。

16. He is fixing his car in the garage. 他在车库里修他的车。

17. She is baking cookies for the party. 她正在为聚会烤饼干。

18. The flowers are blooming in the garden. 花园里的花正在盛开。

19. They are dancing to the music at the party. 他们在聚会上随着音乐跳舞。

20. The train is arriving at the station. 火车即将到达车站。

这些句子涵盖了不同的场景和活动，展示了多样化的句式结构,希望对您有所帮助！