Verb conjugation of "ski" in English

I ran across the bridge to reach the other terminal and asked at the check in counter which connecting flights were still available. I wanted to avoid having to drive into the city at any cost.
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.
I'm from England and am learning German. Maybe we can share tips and tricks. How's your level? If you want to practice together, we can make voice over IP calls and write letters and correct each other.