Yes, I tend to get further and further behind if I don't use the language that I am learning. The problem is that it is so easy to forget the proper pronunciation of things or what phrases have what meaning. As an example, I was forgetting the phrases for "Who are you" and "How are you". They are simple enough to learn and use but if I don't practice them, I forget them. I wasn't happy either because then I had to go back and refresh myself and I felt that I had wasted time that should have been used to learn something new!