`12,` The professor whose daughter won the first prize in the language competition feels very proud.

- whose là ĐTQH chỉ sự sở hữu, whose + danh từ

`13,` The man who rode a red Honda passed here about half an hour ago.

- who là ĐTQH chỉ người, làm chủ ngữ trong MĐQH (who + V + O)

`14,` The number of people who will travel next week will cause difficulties for the airport.

`15,` That is just the thing which I don't want to happen.

- which là ĐTQH thay thế cho danh từ chỉ vật

`16,` He who always likes to do something new can change the situation.

`17,` Hoan Kiem Lake, whose water is always blue, is historical place.

- Khi danh từ cần bổ nghĩa là tên riêng thì dùng MĐQH không xác định (có dấu phẩy)