1.) He would ask me to work on my r's and my n's.
2.)The reason why this is normal to him is because he probably learned how to do it that way at a young age and he keep doing it over and over.
The first picture of the cabinet the line of symmetry would be between the two doors so if you flipped either one over it would be the same.
The second picture of the lake shows reflection by the water works as a mirror and and so everything above the water shows up on the water
The third picture of the graph shows a grid and it reflects over the y-axis which would be the line of symmetry and the blocks between the y-axis shows the reflection.