Maksi you are doing wonderfully. I have had three Japanese exchange students and it will be little sayings that throw you the most. I like the time I told our student we were having tacos for lunch. She about fell over. She said she was not eatting taco. I ran to my dictionary to see what she thought I meant. OCOTOPUS. Yes I see why she did not want to eat taco. But it was a totally diffrent taco. Just ask and there are threads about sayings that are puzzling. It may make some things clearer and it may make things more confusing. You might like to look anyway.
http://www.quiltingboard.com/t-30554-1.htm