1. Last weekend, I went to the park with my family. We had a picnic and enjoyed the beautiful spring weather.

2. I studied for my English test last night. I read many pages and practiced listening to the tape.

3. My friends and I played soccer at the park last Saturday afternoon. It was a lot of fun!

4. We visited the museum last Wednesday. We saw many interesting exhibits and learned a lot.

5. I helped my parents clean the house last weekend. It was a good way to spend time with them.

6. Last summer, I went on a trip to the mountains with my grandparents. We took many pictures and had a great time.

这些句子使用了过去时态来描述过去发生的事情，适合六年级学生的英语写作水平。