CHUYỂN TỪ HTHT SANG QKĐ

CHUYỂN ĐỔI TỪ THÌ HIỆN TẠI HOÀN THÀNH SANG THÌ QUÁ KHỨ ĐƠN (VÀ NGƯỢC LẠI)

* Dạng 1:         S + HTHT (phủ định) + for + thời gian        It’s + thời gian ….+ since …+ last + QKĐ (khẳng định)
Ex: I haven’t seen my father for one month. 
      – It is one month since I last saw my father.
      Tom hasn’t had his hair cut for over three months. 
     – It is three months since Tom last had his hair cut. 
 
* Dạng 2:       S + HTHT (phủ định) + before      It’s + the first time + S + HTHT (khẳng định)
Ex: I haven’t seen that man here before. 
    – It is the first time I have met that man here.
      It is the first time I have read this book. 
    – I haven’t read this book before.
 
* Dạng 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
Ex: I haven’t heard him since August. 
     – The last time I heard him was in August.
      I haven’t seen him since I left school. 
     – I last saw him when I left school.                                                                   
 
* Dạng 4:     S + HTHT (khẳng định) + for + thời gian     - S + began / started + V-ing + thời gian + ago
Ex: I have worked here for ten years. 
     – I began working here ten years ago.
      It started raining two days ago.   
     – It has rained for two days.