BÀI TẬP VỀ SỰ HÒA HỢP CÁC THÌ
1. He has never eaten this food before. ( This is the first time + S + have/ has + Vpp <=> S + haven't/hasn’t + never + Vpp+…before )

2. This is the first i have eaten this kind of food. ( This is the first time + S + have/ has + Vpp <=> S + haven't/hasn’t + never + Vpp+…before )
3. My father hasn't seen his brother for nearly 20 years. ( It's + khoảng thời gian + since + S + V2 + O <=> S + have/has + (not) Vpp + O + for... )
4. I haven't gone swimming since i was in France. ( The last time + S + V2 + was + QKĐ <=> S + haven't/ hasn't + Vpp + was ... )
5. It's two weeks since you last tided up this room. ( S + have/has + (not) Vpp + O + for... <=> It's + khoảng thời gian + since + S + V2 + O )
6. Mr John last visited France in 1990 ( S + have/has + (not) Vpp + O + since ... <=> S + last + V2 + O ... )
7. I have never met such a famous singer before. ( This is the most + adj + N + S + have + (ever) Vpp <=> S have never + Vpp + such + a/an + noun + before )
8. We haven't seen our grandfather for two years. ( S + have/has + (not) Vpp + O + for ... <=> S + last + V2 + O ... )
9. They haven't talked to each other for two months. ( S + have/has + (not) Vpp + O + for ... <=> S + last + V2 + O ... )
10. When my mother came home, my father had watered all the plants in the garden. ( Khi mẹ tôi về nhà, ba tôi đã tưới xong tất cả các cây trong vườn )