1.Cấu trúc câu bị động: S(o)+V+by O.
The day of the meeting will be changed again.
2.Câu điều kiện loại 2: If+S+V2/ed,S+would/could+O
If we had enough money, we could by that house
3.Although+S1+V1+O1,S2+V2+O2
Although Mrs.Thoa was tired, she helped Tuan with his homework
4.Thì HTHT: S+have/had+V3...
We haven't seen our grandfather for five months