◆to change your tune or sing another tune or sing another a different tune<非正式>改变调子;变卦;改变观点
You've changed your tune since this morning, haven't you?你从今天早上就变卦了, 是不是?
At this point Straw changed his tune. 'Yes, I know of a missing file,' he said.这时斯特劳的态度变了。“是的, 我知道丢了一份文件。”他说。