Verb conjugation of "wane" in English

By the way: I have now met a man who claims he is an expert in deep snow skiing... I find that very impressive for someone with only 3 years of snowboarding experience. It is probably just showing off.
This afternoon I will fly to Chile. My two brothers and sisters live there. They are also very old and my brother has already died. My parents emigrated 30 years ago, but they wanted to stay.
I am in my German lesson and I'm learning about the subjunctive. I had never heard about it before. Can you ever deal with all Verb conjugations? I just totally misunderstand the past tense!