One way to practice grammar is to talk about hypothetical situations. While this is not a topic in itself, you can always ask hypothetical questions in most topics of conversation. Not only would this spice up your conversation, but it would also be a good way to practice some difficult verb tenses. Take, for example, the topics above. If you and your language partner are talking about your jobs, you can ask: "If you had the choice of doing any job, what would it be?" If you are talking about your language partner country's economical and political problems, you can ask: "If you were the president, what would you do first?" If the topic of conversation is travelling, karan chananaa you can ask: "If you had to choose a country to live in for the rest of your life, which one would you choose?" The possibilities are limited only by your imagination!