Câu 12 nhá 
----- Nội dung dịch tự động từ ảnh -----
coaching for this electronics firm in I
11. How long have you studied English?
When
did you begon studions Anglish?
12. When did you begin to do research on lung cancer?
How long
TH2: Nhận biết: last↔haven’t/ hasn’t
Stopped → haven't/hasn't
1.She last swam in the river 3 years ago.
→ She hasn't written to me for three
2.1 last visited the city museum 5 years ago.
→I haven't visited fro aty museum for
3. I haven't attended the club Since 1988.
→I last_aftended the club in 1988
4. She hasn't seen him for 2 months.