Verb conjugation of "übernehmen" in German

I have contacted you 12 months ago to propose your school's inclusion in our language school directory. I wanted to inform you that our site achieved high positions in search engines last month.
You have to be careful when you go on summer vacation. There are many dangers but the most dangerous one is the sun itself, because if you're not careful it may harm you. People underestimate the rays.
If you want to write again in Spanish, just do it. I have much to do at the moment, again and again... Sometimes it happens that I must work at night until the early hours of the morning.