1:Which plance should i take to beijing could you tell me 2:

1.Could you tell me which plane should I take to Beijing?
2.Can you tell me when does the train leave?
3.Do you know where he did go?
4.Please tell me if you have received a letter from him yet?
5.Lintao said that they would stop in Japan on the way to Beijing.

什么问题？

1 Could you tell me which plance should i take to beijing ?
2Can you tell me what time does the train leave ?
3 Do you know where did he go ?
4Please tell me have you received a letter fr...

Could you tell me which plane I should（是I should,绝对不是 should I ，要用陈述语序） take to Beijing?
Could you tell me when the train leaves?
Do you know where he went?
Please tell me wheather you have recieved a letter from him?
Lintao said they would stop in Japan on the way to Beijing?

宾语从句中一定为陈述语序.
Could you tell me which plane should I take to Beijing?
Could you tell me when the train leaves?
Do you know where he went?
Please tell me wheather you have recieved a letter from him?
Lintao said they would stop in Japan on the way to Beijing?