33. We must go to class on Saturday. 
   must + V: phải làm gì
34. We mustn't throw garbage. 
   mustn't + V: không được làm gì 
35. We have some chairs and a table in the kitchen.   
   There + be = S + have/has: (ai đó) có cái gì
36. You should take a waterproof coat during your trip to Fansipan Mountain because it is rainy there.
   S + should + V: khuyên ai đó làm gì
``
37. HLB has a lot of marvelous islands.
38. You must brush your teeth three times a day. 
39. Tourists can visit many fishing villages and national parks there.
40. I need to put on some sun cream because it is so sunny today.
``
Công thức chung: S + V + O 
HTĐ: S + V/Vs/Ves + O
Động từ khuyết thiếu + V0
Kết quả + because + nguyên nhân