- 你是不是刚认识他？
Did you just get to know him?
- 我们是不是直飞美国？
Are we making a nonstop flight to the U.S.?
- 你对她是不是一见钟情？
Did you fall in love with her at first sight?
- 这把伞是不是你的？
Is this your umbrella?
- 她问我是不是发生了什么事。
She asked me if anything was the matter.
- 他还没有来，不知道是不是发生了甚么意外？
He has not come yet. Something may have happened to him.
- 这首诗是不是莎士比亚写的，恐怕是无从考究的了。
Whether Shakespeare wrote this poem or not will probably remain a mystery.
