If I were stranded on a deserted island and had only a king-sized bed sheet, a medal coat hanger, lots of paracord, and a sharp hunting knife, I could probably survive there until someone rescued me.
I could use the king-sized sheet in multiple ways. One way I would use it is to make a shelter. I would gather up some long, sturdy pieces of wood, bamboo, or whatever is available for the structure of the tepee. Next, after making the shelter, I would put the sheet on top of it and tie it to the sticks (or whatever material I would be using for the structure) with the inside of the paracord (also known as the core).
The second way I could use the sheet is as a blanket to keep me warm; I could also use it as clothes. The way I would do that is I would rip the sheet, find a thin and pointy stick, and start sewing, and the thread would be the paracord.
The third thing I could make are scarves and face covers, the same way I would make the clothes with the sheet.
The fourth thing that I could use the sheet for is a sail. If I had a boat, I would make a mast with a long, sturdy stick, and then I would attach the sheet to the mast.
The fifth and final thing I have in mind is that I could use the sheet as a carrying bag. I can attach it to a stick with some paracord and put in it items like food, animals, and other things that I might need to carry in it.
I might need a hanger to reach things that are too high or out of reach. I could also use it as a hook for fishing and other things I would need. I could also shape the hanger into a fishing pole and fish with it.
I would use the knife to whittle the material that I find on the island and make the different tools I might need. I would also use the knife to hunt animals so I could eat them, and I would use the paracord to tie them up after I killed them.
These are some creative ways I could use four items, which are a king-sized bed sheet, a medal coat hanger, lots of paracord, and a sharp hunting knife, to survive on a deserted island.