CHUYỂN ĐỔI TỪ THÌ HIỆN TẠI HOÀN THÀNH SANG
THÌ QUÁ KHỨ ĐƠN (VÀ NGƯỢC LẠI)
* Dạng 1:
S + haven’t/hasn’t V3/V-ed + for + thời gian
® It’s + thời gian ….+ since …+ last + V2/V-ed
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 over three months since Tom last had his hair cut.
* Dạng 2: It’s + the first time + S + have/has V3/V-ed (đây là lần đầu...)
Û S + haven’t/hasn’t V3/V-ed + before
Û S + have/has NEVER V3/V-ed + before
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.
® I have never read this book before.
* Dạng 3: - S + last + V2/V-ed …+ when + mệnh đề lần cuối cùng...)
- The last time + S + V2/V-ed + was + thời gian
Û S + haven’t/hasn’t V3/V-ed + since / for + …..
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.
The last time she went out with him was two years ago
– She hasn’t gone out with him for two years.
* Dạng 4: S + began / started + V-ing + thời gian + ago
Û S + have/has V3/V-ed + for + thời gian
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.
Note: Nếu trong câu không có “ago” mà có “when+mệnh đề” thì ta giữ nguyên mệnh đề chỉ đổi “when” thành “since”
* Dạng 5: When did + S + V...?
Û How long + have/has + S + V3/V-ed...?
Ex: When did you buy it?
- How long have you bought it?