The mouse is green. The mouse visits the squirrel. The squirrel needs the mouse. If the mouse chases the squirrel and the squirrel needs the mouse then the squirrel is young. If something visits the squirrel and the squirrel needs the mouse then the mouse needs the squirrel. If something needs the mouse and the mouse chases the squirrel then it needs the squirrel.
The mouse needs the squirrel.