Viết lại câu :
1. My mother helped me do that .you met her last Friday(relative pronoun)
->…………………………………………………………………………….…………………..
2. These books are very interesting. I borrowed them from the library. (relative pronoun)
->…………………………………………………….……………………………………………..
3. Max isn’t home yet. That worried me. (relative pronoun)