Open the PDF. Pick a lesson you failed last month. Redo it. Erase your old shame. Learn.

Suddenly, the sentences are longer. The -te iru form now has four new meanings. Keigo (honorific language) appears, and your brain freezes.

Beyond the Textbook: Mastering Minna No Nihongo 2 with the Renshuu PDF (Workbook)

In fact, the Renshuu is more important than the textbook for Book 2.