The painting is bigger than the photograph ̣̣̣(not as....as)

⇒ The  photograph  is not  as  big  as  the  painting

    This painting is more expensive than my painting (not as .... as)

⇒ My  painting  is not  as  expensive  as  this  painting

    This picture is the same as the picture in our room (not different from)

⇒ The  picture  in  our  room  is not  diffrent  from  this  picture

(chúc bạn học tốt nhé ! 100% đúng nhé)

The photograph is not as big as the painting 

My painting is not as expensive as this painting

This picture is not different from the picture in our room