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 

=>

1. He visited his parents 3 weeks ago.

2. They will have a trip to Sapa this weekend.

3. The hotel where we stayed for 2 days is very noisy.

4. It was such foggy weather that the flight couldn't take off.

5. Tom wishes he had passed the driving exam last month.

6. The hotel is not cheap enough for them to stay.