Reporting affirmative statements is a grammar used to tell someone else about a past conversation. When reporting speech, pronouns and verb tenses change. For example, "I" becomes "she" and present tenses become past tenses. Time words like "tonight" also change to reflect the past context of reported speech, becoming "that night" in the example. Verb tenses change from present to past, and sentences that were already in the past use the past perfect tense when reported.