宾语从句和that

当然，that只是引导词，可以省略，不影响原句，宾语从句的语序要用陈述语序

Excuse me, would you please tell me where I can buy a camera.

有问题啊
应该是I can
有没有that都得加。。

can i 改成 i can

Excuse me, would you please tell me that where I can buy a camera?
that从句后用陈述语句