Verb conjugation of "grouiller" in French

Hi, I'm back from my vacation. It gives me pleasure to learn Spanish, because I can feel the improvement continously. I studied medicine in the University of Montpellier, a student city in France.
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 have accepted you into my friend list, you have to accept me now too. Great! My goal is to have a good level in English, so that I can find a decent job in England or in the United States.