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16. The green book is thinner than the blue one.
17. Tam doesn't type as fast as she used to.
18. Peter is less intelligent than Mark.
19. Hue is smaller than Ho Chi Minh City.
20. This garden is less beautiful than yours.
21. My mother is less impatient than my father.
22. My father has been away on business for 2 days.
23. Susan's sister sings less beautifully than her.
24. Nam doesn't drive as carefully as his sister.
25. The teacher said to me that I should learn the new words by heart.
26. Watching sports is not as interesting as playing sports.
