Verb conjugation of "flatten" in English

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.
On the frozen lake, you can skate, but I would never dare it because it is far too dangerous. Who knows how thick the ice really is and how accurate the measurements are. It can break.
What kind of movies do you prefer? Anyway, should I write you to your email, vocabulix inbox, regular mail? I'm living in the North of the U.S., near the Canadian border. Have you ever been here?