Bài 1:
1. This last time she came back to her hometown was for year ago.
-> She hasn't come back to her hometown since last year
​2. He started working at a bank clerk 3 months ago.
-> He has started working at a bank clerk for 3 months
3. It has been 5 years since we first flew to Singapore.
-> The last time we flew to Singapore was 5 years ago
4. I last had my hair cut in November.
-> I have had my hair cut since November
5. The last time we called each other was 5 months ago.
-> We haven't called each other for 5 months
6. It is a long time since we last met.
-> We haven't met each other for a long time
7. When did you have it ?
-> When have you had it?
8. This is the first time I had such a delicious meal.
-> I haven't had such a delicious meal before
9. I haven't seen him for 8 days.
-> The last time I saw him was 8 days ago
10. Today is Saturday, i haven't taken a bath since Wednesday.
-> I haven't taken a bath for 3 days