31. That river is not as safe as this river.
32. That car is more expensive than this car.
33. My house is not as big as his house.
34. According to me, Maths is not as easy as English.
35. Minh's house is not as small as his father's house.
36. This book is more interesting than that book.
37. The pen is more expensive than the ruler.
38. Her morther doesn't cook as well as my mother.
39. That book is not as good as this book.
40. This car is not as good as that car.
41. Minh is not as bad as Hoang.
42. His city is not as far as my city.
43. My meal is not as good as Khang's meal.
44. Life in the country is not as good as life in the city.
45. Her school is not as beautiful as Minh's school.