I (don't play tennis / doesn't play tennis).
I don't play tennis.
He (play / plays) video games.
He plays video games.
He (don't play basketball / doesn't play basketball).
He doesn't play basketball.
He (roller skate / roller skates).
He roller skates.
I (play / plays) the piano.
I play the piano.
She (listen / listens) to music.
She listens to music.
She (doesn't watch / don't watch) TV.
She doesn't watch TV.
I (doesn't read / don't read ) books.
I don't read books..
He (doesn't do karate / don't do karate).
He doesn't do karate.
I (skateboard / skateboards).
I skateboard.