编辑以下两个句子，使它们具有相同的句子结构。
- "我喜欢游泳，但我不喜欢跑步。"
- "The teacher graded the homework carefully, and then handed it back to the students."
- "我喜欢游泳，不过我不喜欢跑步。"
- "The teacher carefully graded and handed back the homework to the students."