The two reason are development and if a event happens to the character, the character would change his attitude toward life, like someone dying would change the tone of the story.
It is a complete and correct sentence.
Answer:
I don't know if you still need this but I thought it'd be fun to write anyway.
<em>I think that that writing is emotional</em>
<em>it is always new, always different</em>
<em>As long as it tells a story</em>
<em>Sometimes I feel more indifferent</em>
<em>When there's no theme.</em>
<em>When the event is insignificant.</em>
<em>I think writing is beautiful</em>
<em>Sometimes makes me incoherent</em>
<em>Because it's magnificent</em>
<em />
Don't know if this helps, the instructions were kind of unclear, but hoped this helped!
<em>Stay cold, </em>
<em>Brook</em>