German language

Two weeks in US really killed my German language. I couldn't remember all the German grammars like akkusativ, dativ, perfekt, adjecktiv, etc etc. My teacher will always said "Herr Wijaya, du hast alle vergessen!" (Mr. Wijaya, you have all forgotten). Anyway, it's kinda funny because she will pronounce my name Herr. Wiyaya....The germans dun know how to pronounce my last name correctly. Anyway, after 4 lessons of german since returning to US, my German is almost back on track. Start to erase English grammar now...As if it's either I run my brain with Windows XP or Mac OSX...no dual OS!