1. This last time Tom came back to his hometown was 5 years ago. => Tom hasnt 2. He started working as a teacher 6 months ago. => He has.. 3. It has been 3 years since we first went to Japan. => We have. 4. I last had my hair cut in June. => I havent. 5. The last time we met was 2 years ago. => We havent. 6. It has been a long time since we last called each other. => We havent. 7. When did you have 10 scores in Math? => How long..? 8. This is the first time I had such an exciting trip =>I have never 9. I havent seen Anna for 10 days. => The last. 10. Today is Sunday. I havent taken a bath since Thursday. => It is

`1` Tom hasn't come back to his hometown for 5 years

- The last time + S + Ved/V2 + O + was + time 

- S + has/have + not + Vpp + for/since + time 

- come -> came -> come (v)

`2` He has worked as a teacher 6 months ago 

- S + started/began + to V/V-ing + when/in/on/... + time

- S + has/have + Vpp + for/since + time

`3` We have not gone to Japan for 3 years 

- It has been + time + since + S + (last) + Ved/V2 + O 

- S + has/have + not + Vpp + for/since + time

`4` I haven't had my hair cut since June

- S + last + Ved/V2 + O 

- S + has/have + not + Vpp + for/since + time

`5` We haven't met for 2 years

- The last time + S + Ved/V2 + was + time

- S + has/have + not + Vpp + for/since + time

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

- It has been + time + since + S + (last) + Ved/V2

- S + has/have + not + Vpp + for/since + time

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

- When hỏi thời gian không cụ thể

- How long hỏi khoảng thời gian 

- When + did + S + V nguyên + O ? 

= How long + has/have + S + Vpp + O ? 

= How long ago + did + S + V nguyên + O 

`8` I have never had such an exciting trip before

- This is the first time + S + Ved/V2 + O 

- S + has/have + never + Vpp + ... + before

= S + has/have + not + Vpp + ... + before

`9` The last time I saw Anna was 10 days ago 

- The last time + S + Ved/V2 + was + time

- S + has/have + not + Vpp + for/since + time

`10` It is three days since I last took a bath 

- S + has/have + not + Vpp + for/since + time

- It's + time + since + S + (last) + Ved/V2 + O 

- take -> took -> taken (v) 

* Note : 

- for + khoảng thời gian 

- since + mốc thời gian