Resposta:
1. The car WHICH you're looking at is mine
2. That is the picture for WHICH I looked yesterday
3. That is the book WHICH I looked for yesterday.
4. That is the house WHICH gardens are beautiful.
5. That is the man from WHOM I bought the car.
6. That is the man WHOSE children are nice students.
7. Is this the cat WHICH you wanted to buy?
8. She is the girls WHOSE father is Paul North.
9. The boy WHO I saw yesterday is the teacher's son.
10. The man about WHOM we were talking is rich.
11. George Amado is the author WHOSE books are very realistic.
12. That is the girl WHOSE house is huge.
13. The car WHICH you're talking about is very expensive.
14. Is that the boy WHO you wanted to date?
15. The man at WHOM you looked is my father.
16. The woman to WHOM you're talking is my mother.
17. The book for WHICH he's been looking is expensive.
18. That is the man WHOSE car I bought last month.
Explicação:
Which (que, o qual, os quais, a qual, as quais): relativo a coisas e animais.
Who e Whom (que ou quem): relativo a pessoas.
Whose (cujo, cuja, cujos, cujas): relativo à posse, é usado para pessoas e animais.
