31. There is usually a lot of information on these programmes.

33. We should visit and help him with housework. ( should + Vinf )

35. If you don't hurry, we will miss the bus.

-> If you hurry, we won't miss the bus. ( if 1: If + S1 + Vs/es, S2 + will + Vinf )

37. She hasn't gone back to her home village for 2 years. 

-> It is + khoảng thời gian + since + S + V2/ed = S + have/has + not + Vpp + for + khoảng thời gian 

39. That was the cheapest fridge that my mother could find.

31-32 -->There is usually a lot of information on these programmes

33-34 -->We should visit and help his housework

35-36 -->If you don't hurry up, you will miss the bus.

37-38 -->She hasn't gone back to her home village for 2 years

39-40 -->That was the cheapest fridge my mother could find