Do you know if/where …

结构︰一般疑问句＋疑问词（what／where／when 等）＋子句

说明︰此句为双重<疑问句>。疑问词后面采用正常词序，不用倒装词序。

Can you tell me where the teacher has gone?
你能告诉我老师到哪里去了吗？
Have you any idea where he comes from?
他是哪里人，您知道不知道？
Do you know if they like this new item?
你知道他们是否喜欢这个新品种？
Do you know who wants to go with me?
你知道谁想跟我一起去吗？
Do you know when the train will leave?
你知道火车何时开吗？
Can you tell me how much you earn a month?
你能告诉我你一个月赚多少吗？