1. He has not seen his relatives for a long time. ( It's) -> It's been a long time since he saw his relatives.

2. How long have you lived in Da Nang? ( when) -> When did you start living in Da Nang?

3. This homework is too difficult for me to do. ( easy) -> This homework is not easy for me to do.

4. It took me a day to visit Da Lat. ( visiting) -> Visiting Da Lat took me a day.

5. They said: "we have learnt English for many years." -> They said that they had been learning English for many years.

6. Lan is a person. She always helps other people. ( who) -> Who is the person that always helps other people? Lan.

7. I am not tall, so I can't play volleyball. ( if) -> If I were tall, I could play volleyball.

8. No one in my class is as tall as Lan. ( tallest) -> Lan is the tallest person in my class.

9. Lan is as tall as Nga. ( same) -> Lan and Nga are the same height.

10. She began to work in the garden an hour ago. ( worked) -> She has been working in the garden for an hour. 🤓