Intermediate III starts from Unit 39, which is based on the last 3 courses. In the following videos, we'll discuss about your experience, travelling, telling somebody how to do something, etc. "guo" is one of the most important grammar in Chinese. You can master it easily if you follow teacher's instructions. Also, "bǎ" sentence is often heared when you talk with Chinese. Here, we'll learn. After Intermediate III, you can try HSK level 2.