In this lesson the important cultural notion of "group" is in play with the expressions "our group" พวกเรา and your group พวกเธอ. Teacher Pailin reinforces Thai cultural values by reviewing the things that the children รู้จัก "know how to do" (to think and do), not simply รู้ "knowing facts and figures".Grammar-wise, we see the use of the superlative in "the most" มากที่สุด.The words สุด and สิ้น both carry the sense of termination, but the former ends something in a point in time (.e.g., the very last day of the month, the last child), while the latter applies to a slightly longer stretch of time (e.g., the final days or ending of the month or year). The former collocates with more words than the latter.