Study Guide Shabbat 9 The Tosefta brings the opinion of Acherim, Rabbi Meir, who holds that the status of the threshold depends on whether the door os open or closed. The gemara asks how this could be even without a lechi? The gemara brings two answers - in each answer there is some sort of beam above and it is either for an alley or for a house. It is based upon a law that explains that one can view a beam as if it comes down and creates an imaginary wall. However that will only work upon certain conditions. If the threshold itself is private, one cannot carry from the house to there as the rabbis forbade carrying from one private domain to another. The next mishna discusses things one cannot do just before the time for mincha arrives as one may get distracted and forget to daven mincha. Which mincha are we referring to - gedola or ketana? If one started, one doesn't need to stop - what is considered "started"?