1. His name is Nam.

=> This is Nam.(câu đầu tiên)

2. He is twenty-three years old.

=> He is twenty-three years old and he is an engineer.(ở câu số 2)

3. He is an engineer.

=> He is twenty-three years old and he is an engineer.(cx ở câu số 2từ trên xuống)

4. There are five people in his family.

=> There are five people in his family.(câu số 3 từ trên xuống)

5. His father is fifty years old.

=> His father is fifty and he is an engineer,too.(câu số 5 từ trên xuống)

6. Yes, he is 

=> His father is fifty and he is an engineer,too.(cx câu số 5 từ trên xuống)

7. His mother is forty-eight years old.

=>His mother is forty- eight years old.(câu số 4 từ dưới lên)

8. No, she isn't

=>She is a doctor (Câu số 3 từ dưới lên)

9. His sisters are twelve and seventeen.

=> His sisters are twelve and seventeen.(Câu số 2 từ dưới lên)

10. They are students.

=>They are students.(Câu cuối cùng)