Do you know where is … ?Can you tell me how can I get to …?
Could you tell me how to get to …?
Can/Could/Will/Would you please tell me sth. 表示十分客气地询问事情
Could you tell me how to get to the park? 请你告诉我怎么才能去邮局好吗?
上面句子中的how to get to the park是疑问词与动词不定式连用,用作宾语
但不是宾语从句(这一点要搞清楚,它不是宾语从句),相当于how I can get to the park(宾语从句)
I don't know how to solve the problem=I don't know how I can solve the problem. 我不知道如何解决这个问题
Can you tell me when to leave? =Can you tell me when I will leave? 你能告诉我什么时候离开?