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?

8. This is the first time I had such an exciting trip =>I have never had such an exciting trip before

9. I haven’t seen Anna for 10 days. => The last time I saw Anna was 10 days ago

10. Today is Sunday. I haven’t taken a bath since Thursday. => It is 3 days since I last took a bath