1. Please tell me (how much you paid for the clothes). 宾语从句
2. I want to know (when the train leaves). 宾语从句
3. Could you tell us (if/whether Mr. White enjoys living in Shangha)i? 宾语从句
4. (That his mother is ill) is because she is very tired. 主语从句
或:The reason his mother is ill is (that she is very tired). 表语从句
5. (That we are short of money) is the problem. 主语从句