是不是

• is or isn't
• yes or no
• whether or not

例句

1. 我一离开商店，就有一位男士向我走来，问我是不是叫彼得。
   No sooner had I left the shop than a man came to me and asked me if my name was Peter.
2. 问他那是不是真的。
   Ask him if it is true.
3. 你肯定不会跳水，是不是？
   I bet you can't dive, can you?
4. 头大是不是表示智慧高？
   Is a large head indicative of high intelligence?
5. 你觉得收音机的声音是不是太吵了点？
   Don't you think the radio's a bit loud?