Question: What does he refer to?

Suggestion: He refers to the first matter [in our Mishnah, tying a rope on a bucket].

Rejection: There he totally permits, and here he taught "one is not liable for it." This implies that there is an Isur, like the Gemara inferred above (111b)!

Answer #1: He means as follows. Any knot that is not permanent, one is not liable for it. This implies that if it is permanent, one is liable for it, and even a bow! This teaches unlike Rabanan, who say that a bow is not a knot.

Answer #2: R. Yehudah refers to what the Reisha (111b) taught "one is not liable for them."

Explanation #1: Rav teaches that we do not decree a weaver's rope due to a regular rope. This is like R. Yehudah.

Explanation #2: Even Rabanan agree that even with a regular rope, it is not common that it will be a permanent knot when he ties it to a cow and a feeding trough. Therefore they do not decree about a weaver's rope.

Pesak: From here we learn that one may not fold Talesim of the Beis ha'Keneses (after using them on Shabbos morning), for this is a need of tomorrow.

Pesak: Since we have other [garments] to change into them, it is forbidden.

Question: Ri was unsure if it is called "he has others to change into them", when he does not have another as nice as this.

Explanation #1: [It should not be like weekday talk,] e.g. business.

Objection (R. Tam): We already know [to forbid talk of business] from "mi'Metzo Cheftzecha"!

Explanation #2 (R. Tam): Rather, it is like it says in Vayikra Rabah (34). R. Shimon had an old mother who used to talk much. He said "mother, it is Shabbos.' She was quiet;

Inference: One should not talk on Shabbos as much as on a weekday.

Support: The Yerushalmi says that they toiled to permit greeting people on Shabbos.