Verb conjugation of "frotter" in French

Regarding the meeting in early May: I could not reschedule the appointment at my daughter's doctor and I will definitely know if I can come during the first 2 weeks. I guess we should talk next week.
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've actually found Vocabulix only because I could not conjugate an English word and then I suddenly was there: learning vocabulary, and meeting friends makes so much fun ...