sentence: A man dressed in a black sweatshirt and black shorts, along with another person dressed in white athletic wear are standing in a tennis court near the net. sentence:  They are both holding tennis rackets. sentence:  The person in black is giving a tutorial on how to return a serve in tennis. sentence:  There is a player demonstrating the serve as the coach explains. sentence:  Then the person in white begins taking about more about the tennis serve and how to play effectively. sentence:  The player continues to demonstrate the serves.