Suppose these sentences I made with "so"
The main idea is to place it somewhere so everyone can use it
Please bend so I can pass
It is built in a way so you can bend it and it doesn't break
Are they correct ways to use "so"?
Should or can I use "so that" instead of them?
Are "so" and "so that" interchangeable? Can I reduce "so that" always to "so"?
If "so" is informal? which phrase can I use instead of it in the sentences above?