1. This last time Tom came back to his hometown was 5 years ago. => Tom hasn’t come back to his hometown for 5 years

2. He started working as a teacher 6 months ago. => He has worked as a teacher for 6 months

3. It has been 3 years since we first went to Japan. => We have gone to Japan for 3 years

4. I last had my hair cut in June. => I haven’t had my hair cut since June

5. The last time we met was 2 years ago. => We haven’t met for 2 years

6. It has been a long time since we last called each other. => We haven’t called each other for a long time

7. When did you have 10 scores in Math? => How long have you had 10 scores in Math?

1. Tom hasn' t come back to his hometown for 5 years
2.He has worked as a teacher for 6 months

3.We have gone to Japan for 3 months

4.I haven't cut my hair since June

5.We haven't met for 2 years

6.We haven't called each other for a long time

7.How long have you had 10 scores in Math ?