1. I last saw her three years ago
→ I haven't seen her for three years
2. She started working is this company twenty years ago
→ She has worked in this company for twenty years.
3. They began to play football in 2000
→ They have played football since 2000
4. He started to learn french a long time ago
→ He has learnt French for a long time.
Chúc em học tốt. Cho anh xin 5 sao và CTLHN.