Studying grammar at higher levels is not what everyone enjoys doing as it seems as if we’ve learnt almost everything by that time. However, there are some grammar topics that cause problems among the students, especially inversions, cleft sentences, participle clauses, relative clauses, and double comparatives. In the C1 Summer Course, these topics will be studied thoroughly. The article also provides a table with commonly used inversion structures and examples, as well as online exercises to practice.