Sentence 1: Larry noticed that the doorknob for his bathroom was becoming worn. 
 Sentence 3: Larry researched the best door knobs until finally he found a good one 
 Sentence 4:  He replaced the doorknob himself 
 Sentence 5:  Now Larry is satisfied that he no longer has a worn doorknob 
 Option 1: He decided not to replace it until it fell off. 
 Option 2: He decided it was time for a replacement.