Reported speech is used to report what someone else has said. It involves changing some aspects of the original statement, such as changing verbs from present to past tense. There are two main reporting verbs: say and tell. Say is used with a single object, while tell is used with two objects indicating who was told. When changing a statement to reported speech, present and past tense verbs are changed, pronouns may need to be altered, and time references are adjusted based on the context. Common sense must be used when transforming reported speech statements.