`1.` I know the boy whose book is being read

`2.` I come from a country whose history goes back thousands of year

`3.` The teacher whose course I am talking is excellent

`_____________`

`***` whose  `-` thay thế cho TTSH

`@` N + whose + N + V +...

1. I know the boy whose book you are reading.

2. I come from a country whose history goes back thousands of year.

3. The teacher whose course I am talking is excellent. 

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- Đại từ quan hệ whose thay thế cho tính từ sở hữu / từ chỉ sở hữu (whose + N)