=>

30. Have you ever talked to the man who lives next door?

31. Those are the keys which open the front door and back door.

32. I bought a dress which was very expensive.

33. Ms Lan, whose daughter won the first prize in this contest, is a good English teacher.

34. Half of the people who were invited to the wedding didn't come.

who: đtqh chỉ người

which: đtqh chỉ vật

whose: đtqh thay thế tính từ sở hữu

`30.` Have you ever talked to the man who lives next door?

`31.` Those are the keys that open the front door and back door.

`32.` I bought a dress which was very expensive.

`33.` Ms.Lan, whose daughter won the first prize in this contest, is a good English teacher.

`34.` Half of the people who were invited to the wedding didn't come.

`@` Kiến thức : 

`-` Which thay thế N chỉ vật , làm chủ ngữ / tân ngữ trong câu ( có thể đứng sau giới từ )

`-` That thay thế N chỉ cả người và vật , làm chủ ngữ / tân ngữ trong câu

`-` Who thay thế N chỉ người , làm chủ ngữ / tân ngữ trong câu

`-` Whose + N `=` TTSH + N ( thay thế cho sự sở hữu )