We may not break a shard nor cut a [piece of] paper to roast salted fish on it. Nor may we rake out an oven or a double stove, but we may level [it]. Nor may we position two barrels near each other [in order] to set a pot upon them. Nor may we support a pot with a piece of wood, and the same applies to a door. We may not drive an animal with a stick on Yom Tov. But R’ Elazar ben R’ Shimon permits [this].

R’ Eliezer says: A person may take a sliver from that which is before him in order to clean his teeth, and one may gather [hay or splinters] from the courtyard and kindle [a fire], because everything which is in the courtyard is considered prepared. But the Sages say: One may gather from that which is before him and kindle.