In this shiur we discuss: 1) Tying Knots in Garbage Bags on Shabbos, 2) Blowing Soap bubbles on Shabbos, 3) Drinking Coffee cooked by a non-Jew on Shabbos, 4) Having a non-jew open a car door on Shabbos, 5) Laws related to making early Shabbos, 6) Answering Kaddish, Kedusha etc. during Shemoneh Esrei