把下列句子改为宾语从句1、Who are they waiting for?Do you know?2、Does Mr Brown stay in Room 302?Could you tell me?3、How long have the Smiths lived in Hangzhou?I want to know.

Do you know who they are waiting for?
Could you tell me whether Mr Brown stays in Room 302?
第三道题I wan to know how long the Smiths have lived in Hangzhou.（Smiths是指Smiths一家人）

1. Do you know who are they waiting for?
2. Coudl you tell me if Mr. brown stays in Room 302?
3. I want to know how long have the Smiths lived in Hangzhou.

一:Do you know who they are waiting for?
二:Could you tell me whether Mr Brown stays in Room 302?
三:I want to know how long the Smiths have lived in Hangzhou.

上面的回答前面两个题都对
纠正第三道题
I wan to know how long the Mr Smiths have lived in Hangzhou.

Do you know who they are waiting for?
Could you tell me whether Mr Brown stays in Room 302?
I wan to know how long Mr Smiths has lived in Hangzhou.