当然可以，以下是一些六年级下册的英语课外句子：

What do you usually do on the weekend? 你周末通常做什么？

I enjoy reading books in my free time. 我喜欢在空闲时间读书。

Can you play the piano or the guitar? 你会弹钢琴还是吉他？

My favorite subject is science because it's fun to learn about experiments. 我最喜欢的科目是科学，因为学习实验很有趣。

I'm excited about the school trip next week. 我对下周的学校旅行很兴奋。

My dream is to become a teacher because I love helping others learn. 我的梦想是成为一名老师，因为我喜欢帮助别人学习。

It's important to stay healthy, so I exercise every day. 保持健康很重要，所以我每天都锻炼。

We should respect our environment and recycle paper, plastic, and glass. 我们应该尊重我们的环境，回收纸张、塑料和玻璃。

I like to watch movies with my family on Friday nights. 我喜欢周五晚上和家人一起看电影。

Learning a new language is challenging, but it's also very rewarding. 学习一门新语言很有挑战性，但也很值得。

这些句子涵盖了不同的主题和情境，适合六年级下册的英语水平。希望对你有所帮助！