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28. Food should not be wasted.

S + should (not) + be + V3/ed: bị động - modal verbs

29. The mall has fewer people in the park.

S + has/have + N

30. The last time I saw him was a long time ago.

The last time + S + V2/ed + was + ktg + ago 

31. No boy in his class is as tall as him.

S + be + as + adj + as + O : ss bằng 

32. It was such a long journey that we got very tired.

S + be+ such + (a/an) + adj + N + that + clause: quá .. đến nỗi

33. This bridge was built last year.

S + was/were + V3/ed: bị động - QKĐ

34. My mom doesn't drive as carefully as my dad.

S + (not) + V + as + adv + as + O: ss (không) bằng 

35. I like reading better than watching TV.

like + Ving+ better than + Ving: thích ... hơn ... 

36. That cake is not as sweet as this one.

S + be (not) + as + adj + as + O :ss (không) bằng 

37. He is not old enough to drive a car.

S + be (not) + adj + enough + (for O) + to V: (không) đủ .. để làm gì 

38. No school in the city is as large as mine.

S + be + as + adj + as + O : ss bằng 

39. She started learning English five years ago.

S + started / began + to V/  Ving