6. I'm looking forward to seeing you at Christmas.
- look forward to doing sth: mong chờ, háo hức làm gì.
7. Laurence's not seen his sister since she left from Japan.
- S1+ last+ V2+when+S2+V2...->S1+has/have+not+PII+since+S2+V2...
8. Does it take you 2 hours to surf the web every evening?
-take sb time to do sth=spend time doing sth: dành thời gian làm gì.
9. I suggest waiting for the next bus.
- suggest Ving: gợi ý làm gì.
10. The Internet has been used all over the world.
- Bị động thì hiện tại hoàn thành: has/have+ PII+ (by O).