Bài tập 6: Yesterday the temperature was nine degrees. Today it's only six degrees.
   * It is colder today than yesterday. (Hôm nay lạnh hơn hôm qua.)
 * The journey takes four hours by car and five hours by train.
   * It takes longer to travel by train than by car. (Đi bằng tàu lâu hơn đi bằng ô tô.)
 * We were very busy at work today. We are not as busy as that every day.
   * We are busier today than usual. (Hôm nay chúng tôi bận rộn hơn thường lệ.)
 * Jane cooks better than her sister.
   * Jane's sister doesn't cook as well as Jane. (Em gái của Jane nấu ăn không ngon bằng Jane.)
 * Tom is the best football player in this team.
   * Nobody in this team plays football as well as Tom. (Không ai trong đội chơi bóng đá giỏi bằng Tom.)
 * They understand more than we do.
   * We don't understand as much as they do. (Chúng tôi không hiểu nhiều bằng họ.)
 * It is much more difficult to speak English than to speak French.
   * To speak French is easier than to speak English. (Nói tiếng Pháp dễ hơn nói tiếng Anh.)
 * My interview lasted longer than yours.
   * Your interview didn't last as long as mine. (Cuộc phỏng vấn của bạn không kéo dài bằng cuộc phỏng vấn của tôi.)
 * When I was younger, I used to go climbing more than I do now.
   * Now I don't go climbing as much as I used to when I was younger. (Bây giờ tôi không leo núi nhiều như khi còn trẻ.)
 * Your coffee is not as good as mine.
 * My coffee is better than yours. (Cà phê của tôi ngon hơn cà phê của bạn.)
Bài tập 7:Richard feels good than several days ago.
   * Sửa: better (cảm thấy tốt hơn)
 * Mary and Daisy are both intelligent students. Mary is so intelligent as Daisy.
   * Sửa: as (cũng thông minh như)
 * I found the conversation as most interesting and I was glad to practice my English.
   * Sửa: most interesting (rất thú vị) thành very interesting hoặc extremely interesting
 * The Caspian Sea, a salt lake, is largest than any other lakes in the world.
   * Sửa: largest thành larger (lớn hơn)
 * He drives the car more dangerous than his brother does.
   * Sửa: more dangerous thành more dangerously (một cách nguy hiểm hơn)
 * It was the most biggest building that I had ever seen.
   * Sửa: most biggest thành biggest (lớn nhất)
 * I wish my house were so large as John's. (Câu này không có lỗi sai rõ ràng, nhưng có thể được viết lại rõ ràng hơn: I wish my house were as large as John's.)