Decide whether the sentence is correct or incorrect. 1. Henry had worked as a rescue worker before he was retired in 1990. 2. By 10 a.m. yesterday, rescue workers had freed ten people trapped in the collapsed building. 3. Mr. Jack was no longer there. He left the school six years before. 4. The light went off because they hadn't pay the electricity bill. 5. Hadn't she escaped before the walls collapsed in the earthquake? 6. Her bicycle wasn't there because a friend took it without asking her. 7. He was tired because he hadn't eaten anything since the morning. 8. The children collected mangos that fall from the tree. 9. Has she phoned Nam before she went to see him in Laos? 10. He didn’t ride an elephants before that day.

1.correct

2.incorrect ( free not freed) còn nếu bạn ghi sai thì correct

3.correct

4.correct

5.incorrect

6.correct

7.incorrect

8.correct

9.correct

10.incorrect

                                                          1 . correct

                                                          2 . incorrect

                                                          3 . correct

                                                          4 . correct

                                                          5 . incorrect

                                                          6 . correct

                                                           7 . incorrect

                                                           8 . correct

                                                            9 . correct

                                                            10 . incorrect

                                              Cho mình ctlhn + 5* + cảm ơn