1.Can you tell me how I can get to the post office,
2.Do you know whether it often rains here in spring?
3.I don't know who I can ask for help.(你这里没有给出动词 不过我觉得应该是漏掉ask了吧)
4.He asked me if I was going to fly to London next week or not.
5.He said that he would get a part-time job to save money.