sentence: For example , my pupils had to learn the difference between this and that and I let them make a short film about pointing at things in school saying : this door , that window , this is my teacher , that is a chair .
modified: For example , my pupils had to learn the difference between this and that and I let them make a short film about pointing at things in school saying : this door , that window , this is my teacher , that is a chair .
transformation: noop