Sentence 1: Tim had just learned how to used the telephone at home. 
 Sentence 3: While his mother had gone into the backyard, Tim picked up the phone 
 Sentence 4:  He a bunch of random numbers and hung up many times 
 Sentence 5:  Tim already went back to playing with his toys as his mother returned 
 Given Sentence 2: He had to start thinking about college.