Trying to describe my thoughts: I think I am very lucky to have found a partner to learn languages with for free (common speech)/(a partner with whom to learn languages for free (more formal). I want to practice my English, and I can help him to learn Chinese. Although I only have a little experience in teaching Chinese, (you don’t put « although » and « but » together like you would in Chinese-use one of the other) I think he is very interested in learning/eager to learn/interesting to teach (I’m not sure which you mean, but the last one has a different meaning than the first two). We talked (was this in the past?) about how to make more (types of?) sentences, and next time we will do more practice in Chinese. I must prepare some materials for our next lesson.🤗