1)cutted -> cut

2) working -> worked

3)haven't -> has not

4) eat -> eaten

5)hasn't -> have not 

6) giữ nguyên

7) since -> for 

8)since -> for

9)for -> since 

10) hasn't ->have not

1. I haven't cutted my hair since last June.

                      Sai

=> cutted->cut

2. She has not working as a teacher for almost 5 years.

                          Sai

=> working-> worked

3. This lesson haven't started yet.

                           Sai

=> haven't-> hasn't

4. Has the cat eat yet?

                        Sai

=> eat-> eaten

5. I am worried that i hasn't still finished my homework yet.

                                       Sai

=> hasn't->haven't

6. I have just decide to start working next year.

                        Sai

=> decide-> decided

7. He has been at his computer since seven hours.

                          Sai

=> at-> on

8. She hasn't received any good news since a long time.

                                                                 Sai

=> since-> for

9. My father hasn't played any  sport for last year.

                                                                Sai

=> for-> since

10. I'd better have a shower. I hasn't had done since Thursday.

                                                       Sai

=> hasn't-> haven't

       Chúc bạn học tốt~~