1. (It was an example)
2.Did you know John is planning to call a meeting?
3.Do you know if they`ve ever had hit a single before?
4.I want to know when your leaving (can`t use a question mark for this one)
5.I doubt he told the truth (cant use a question mark here)
6.Could you tell me where the nearest swimming pool is?
7.She wondered who left that message on the answerphone (cant use a question mark)
8.He wanted to know what time they were due to arrive (cant use a question mark here)
Hope this helps :)