这是反义疑问句,所以前后不能一样
所以有两种改法
You were very busy,weren't you?
You weren't very busy,were you?
还有问题可以问我~The weather will be fine tomorrow, will it?Temperatures will rise to 20 degrees Celsius at the day.She buys a new bag three weeks ago.The boy left the house quiet.I am going to London by the train.都有什么错