The lion is asleep in the middle of the jungle and a mouse runs over his paw by accident. The lion wakes up when he feels the mouse on his paw and threatends to eat the mouse. The mouse begs for his life, saying that if the lion will free him the mouse will return the favor one day.
It speaks of a past event (liking the old man) to a future plan (killing him). This cancels eachother out meaning it's present tense (if that makes sense).
<h2><em>So</em><em> </em><em>That</em><em> </em><em>-</em><em> </em><em>I</em><em>t</em><em> </em><em>tells us for what purpose something is done</em></h2>
