A baseball player swings his bat at a ball, the umpire and catcher pay close attention behind him.
a baseball player swings at a ball while the umpire and catcher watch from behind in order to observe the technique.
Sentence 1: A baseball player swings his bat at a ball, the umpire and catcher pay close attention behind him. Sentence 2: a baseball player swings at a ball while the umpire and catcher watch from behind in order to observe the technique.
(-x)
(-x)