1 the photograph is not as big as the painting/ the painting is not as small as the photograph

2 my painting is not as expensive as this painting/ this painting is not as cheap as my painting

3 this picture is not different from the picture in our room

4 the film we saw last week is not as interesting as this one./ this film is not as boring as the one we saw last week

5 the journey is not as long as we thought at first

`1.` The painting is not as big as the photograph 

`2.` My painting is not as expensive as this painting

`3.` The picture in our room is not different from this picture

`4.` The film we saw last week is not as interesting as this one

`5.` The journey is not as long as we thought at first 

`* So  sánh  bằng:` $S_{1}$ + be + (not) + as + adj + as + $S_{2}$

`* So  sánh  không  bằng:`  $S_{1}$ + be + (not) + different from + $S_{2}$