1. He/ visit/ his parents/ 3 weeks ago
⇒ He visited his parents 3 weeks ago
2. They/ have a trip/ Sapa/ this weekend
⇒They will have a trip to Sâp this weekend
3. The hotel is very noisy. We stayed there for 2 days. (relative clause)
--> The hotel which we stayed for 2 day is very noisy
4.It was so foggy that the flight couldn't take off. (such....that)
⇒ It was such fog that the flight couldn't take off
5. Tom didn't pass the driving exam last month. (wish)
⇒ I wish tom had passes the driving exam last month
6. The hotel is too expensive for them to stay. (enough)
⇒ they don't have enough money to stay in the hotel