Translation of belastbar

Grammar exercises give the teachers and the students different ideas. We discussed the need for exercises in my previous email, but unfortunately I did not receive any further feedback since then.
Anyway, there are a lot of people on board and I no matter how high the waves may be, I always suffer from nausea or seasickness. I have not been on a small boat before. I will have to vomit.
I've tried to learn Spanish with this site and it worked well. Do you currently attend a course? I used to attend a language school, but for now I'm too busy. Incredible how fast one forgets the language.