1, I haven't cutted my hair since last June => cut
2, She has not working as a teacher for almost 5 years. => worked
3, The lesson haven't started yet. => hasn't
4, Has the cat eat yet? => eaten
5, I am worried that I hasn't still finished my homework yet. => haven't
6, I have just decided to start working next week. (ko sai)
7, He has been at his computer since seven hours. => for
8, She hasn't received any good news since a long time. => for
9, My father hasn't played any sport for last year. => since
10, I'd better have a shower. I hasn't had one since Thursday. => haven't