Relative clauses (e.g., “which,” “who,” “that”) are useful for adding extra information about a noun. For example: “The company, which was founded in 1990, has expanded significantly.” Passive voice is another important structure, especially for emphasizing the action over the subject, such as: “The report was completed by the research team.” Using these structures correctly can demonstrate a high level of grammatical control and variety, contributing to a higher band score.