Can you tell me? + What is that? ----> Can you tell me what that is?
اصولا جمله آخر رو شما نمی تونید به هیچ شکل دیگه ای بگین.
Can you tell me? + What is going on? ----> Can you tell me what is going on?
Can you tell me? + What happened? -----> Can you tell me what happened?
تفاوت این دو جمله با جمله پایین در اینه که اینجا کلمه what جایگزین فاعل جمله یعنی something شده.
something is going on / something happened.
ولی تو جمله زیر که ساختار عوض می شه کلمه what جایگزین فاعل نشده و فقط کلمه پرسشی هست.
Can you tell me? + What is your name? -----> Can you tell me what your name is?