Suomen kielen jatko-oppikirja
1. Additional information
3. In words
A great book for anyone who has come to the point where most books to learn Finnish with don't offer enough information anymore. The book includes such grammar subjects as the comparative and superlative, the translative, essive, comitative, inessive, abessive cases, a lot about the participles and their different uses as well as the potential tense and more advanced uses of the imperative. The text that comes with each chapter focuses on what grammar subject has been taught in the lesson.
This book comes with an exercise book, so it would be good to purchase both, as they are both excellent for more advanced students!