37. Children should go to bed early.
38. Students shouldn't copy other students' work.
39. Ho Chi Minh City is bigger than Ha Noi.
40. Vinh is the tallest person in our  class

 * It's good if children go to bed early.
 * Children should go to bed early. (Trẻ em nên đi ngủ sớm.)
 * It's not a good idea when students copy other students' work.
 * Students shouldn't copy other students' work. (Học sinh không nên sao chép bài của nhau.)
 * Ha Noi is smaller than Ho Chi Minh city.
 * Ho Chi Minh city is larger than Hanoi. (Hồ Chí Minh City lớn hơn Hà Nội.)
 * No one in our class is taller than Vinh.
 * Vinh is the tallest in our class. (Vinh là người cao nhất lớp chúng ta.)