he doesn't know where the post office is

he doesn't know where the post office is lucy ___(know)where the post office is Do you know where the post office is? where is the post office? Where is the post office. where is Jack?He ( )in the office.He usually doesn't go home Where is the post office It’s next t the excuse office where me post is where is the post office 如何导入 Where is the ______(near)post office? where is the post office?译 Do you know where the post office is?为什么要加个is,去掉不是也行吗