swore

例句：

1. 1. He swore to never tell anyone about it.
   他发誓永不告诉任何人这件事。
2. 2. She swore that she would never forget him.
   她发誓永远不会忘记他。
3. 3. They swore to work together until the job was done.
   他们发誓一起工作直到任务完成。