Verb conjugation of "zurückgreifen" in German

The picture I sent yesterday was taken on the first evening. And this morning the email bounced back. The user has already uploaded 3 different pictures of himself, all with the same facial expressions.
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.
So you are getting used to write in Spanish. But I think you should not worry, as your Spanish is good and you understand everything. You'll enjoy it a lot, once you meet new people who speak it.