Cassidy Reese uses informal English when speaking with friends, family members, and children. She provides an example of using informal language to explain the concept of step-parents to her young nephew. With her sisters, she uses informal greetings and pun-filled text messages. Formal English is used when speaking to strangers, professors, and older generations out of politeness. At the gas station, Cassidy had to use formal English to request help from an AAA operator after locking her keys in her car. The document discusses how people use different versions of English in different social contexts.