Sentence 1: Tom noticed that his porch had become very dusty. 
 Sentence 3: Finally Tom realized that he needed to sweep the porch himself 
 Sentence 4:  He found a broom and swept the porch meticulously 
 Sentence 5:  Tom was happy to see the porch wasn't dusty any longer 
 Option 1: He dusted it every day from then on. 
 Option 2: He tried convincing his son to sweep it, but his son refused.