1.She hasn't kissed me for 5 months.

2.I haven't had such a delicious meal before.

3.The last time I saw him was 8 days ago.

4.It is Monday since I last took a bath.

5.We have learnt English for five years.

6.They have studied English since they were in grade 3.

7.She started to teach the children in this remote village 5 months ago.

8.The last time he wrote to me was in April.

9.She last had a swim 5 years ago.

10.They haven't talked to each other for 2 months.

11. We have learnt English for 5 years.

12.She hasn't seen her elder sister since 1999.

Cấu Trúc :

1-S + HTHT (phủ định) + for + thời gian
   =>  It’s + thời gian ….+ since …+ last + QKĐ (khẳng định)

2-S + HTHT (phủ định) + before
    => It’s + the first time + S + HTHT (khẳng định)

3-  S + HTHT (phủ định) + since / for + …..
    =>  S + last + QKĐ (khẳng định) …+ when + mệnh đề
    => The last time + S + QKĐ (khẳng định) + was + thời gian

 4-S + HTHT (khẳng định) + for + thời gian
    => S + began / started + V-ing + thời gian + ago