找出并抄写一句表明时间切换到过去的句子。

Find and copy a sentence which shows that the time has switched to the past.

请你帮我抄写这份文件吗？

Can you help me copy this document?

他花了一个小时抄写那篇文章。

He spent an hour to copy that article.

我们必须抄写这些数据以备后用。

We must copy this data for future use.

他花了几个小时来抄写乐谱。

He spent several hours copying the music score.

学生们需要抄写老师在黑板上写的内容。

The students need to copy what the teacher writes on the blackboard.

老师要求学生重新抄写他们的作业。

The teacher asked the students to recopy their homework.

她决定为她的朋友重新抄写这份食谱。

She decided to recopy the recipe for her friend.

做完修改后，你应该重新抄写这封信。

After making corrections, you should recopy the letter.

请重新抄写这份文件以确保没有错误。

Please recopy the document to ensure there are no errors.