11 Her picture is different from mine

→  different +  from 

22 Giang can not be as good at painting as Khanh 

→ Good at + sth : giỏi về gì

33 I think living in the country is better than living in the city

→ So sánh hơn : better là tính từ ngoại lệ

44 .Her picture is different from her brother's

→ Thuộc sở hữu nên có 's

→  Sth+ different + from +sth : khác gì