removing a board from a Sukkah. Unplugging a sink. Taking out a leaf from a table. Taking off a mattress from a bed. Taking...
Understanding the Concept of Leaving an Item on a Tree from Before Shabbos into Shabbos. Some Halachas About Using the Side of a Tree;
A few very important points in reference to 'הכנה משבת לחול' (doing an action on Shabbos for a weekday);