Verb conjugation of "grignoter" in French

So you have taken a German course in the Ghoete Institute. Well, I certainly learned something with you, and your German is already a lot better than last time. I think we really did it.
The idea is to use the sourcing to get as much information as possible about learning abilities and disabilities in average. This way we can determine and forecast best practices for language learners based on some parameters.
I'm fine, thanks. I'm sorry that I did not write back to you sooner. As you see I am very busy with my work. But I'll take the time to help you because I promised to do so. So let us start soon.