Meaning: to construct or build something Examples: The people set up camp by the lake. The child was building something with her blocks, so I asked her what she was setting up.

Meaning: to continue without interruption Examples: The discussion ran on for hours. Don't start that book, it runs on for hundreds of pages and never says anything.

Meaning: to be very busy doing something Examples: My new boss asks me to do a million different things. She makes me run around all the time. I am tired, I have been running around all day, fixing the house, doing the shopping, etc.