my japanese teacher(who also practice aikido - 2nd dan) told me that "shita" is past tense so I usually say arigato gozaimashita after everything.
but yesterday my aikido instructor told me that we use "shita" for something that is still continuing e.g: after pairing up but the class is still in session. when I shared with him what I know from my japanese teacher, he insisted that his understanding is the correct one(aikido instructor - 1st dan) because he's checked with 3 aikido dictionaries from 3 different aikido organizations..
what do u guys think? what do u usually say after pairing up and after class? is it arigato gozamasu or arigato gozaimashita?