-----Nếu có 1 câu phụ, chúng ta có nhiều câu khác----
Tell me who had a heart operation 2 months ago.
Do you know who had a heart operation 2 months ago ?
It’s nice to tell who had a heart operation 2 months ago.
There is no news about who had a heart operation 2 months ago.
Doctors tell who had a heart operation 2 months ago.
No one knows who had a heart operation 2 months ago.
Who had a heart operation 2 months ago is a secret.
Who had a heart operation 2 months ago is confidential.
Who had a heart operation 2 months ago is what I want to know.
