Hi Jessica. I hope this helps:
not have two pennies to rub together
To be extremely poor; to have very little or no money to spend.
Example: During college, when I didn't have two pennies to rub together, I survived off of ramen noodles for months at a time.
Example 2:They used to be so well off, but after the economy crashed and their business closed, they don't have two pennies to rub together anymore.
Now make few sentences yourself to wrap it up for you.