Final answer:
In 'Animal Farm,' Squealer's speeches change from being persuasive to increasingly deceptive and manipulative. The purpose of the change is to maintain control and justify the pigs' actions. Squealer's speeches are used when the pigs need to manipulate the truth in conflicts or leadership changes.
Step-by-step explanation:
In George Orwell's novel 'Animal Farm,' Squealer, the pig, serves as the propaganda mouthpiece for the ruling pigs. Throughout chapters 6-10, Squealer's speeches evolve from initially being persuasive to becoming increasingly deceptive and manipulative. The purpose of this change is to maintain control over the other animals and justify the pigs' actions. Squealer's speeches are used in situations where the pigs need to manipulate the truth, especially when there are conflicts, revolutions, or changes in the farm's leadership.