37. If you change the way you learn vocabulary, you can improve your English.

if 1: If + HTĐ, S + will/can/shall + V1 

38. I suggest energy-saving bulbs should be used to save electricity.

S + suggest + (that) + S + (should) + V1: đề nghị 

S + should be + V3/ed: bị động - modal verbs

39. Mat Biec, which is written by Nguyen Nhat Anh, is known as the most romantic story with sad ending

N (vật) + which + V/ S + V 

S + am/is/are+ V3/ed: bị động - thì HTĐ

40. Nam congratulated Nga on winning the first prize in the English speaking contest.

S + congratulated + O + on + Ving: chúc mừng ai ... 

`color{orange}{~MiaMB~}`