3. 在一个包含10,000个单词的英文文本中，找出并列使用的动词对，并将它们列出来，其中每个动词对只需出现一次（不包括动词变形形式）。


The sun was shining and the birds were singing. The wind was blowing and the trees were swaying. The children were playing and laughing in the park.
出现的动词对：

- was shining / were singing
- was blowing / were swaying
- were playing / laughing