Sentence 1: The teacher came into class and sat down. 
 Sentence 3: We had to call the medics since she couldn't get back 
 Sentence 4:  She was diagnosed with a broken tailbone 
 Sentence 5:  The principal sent a substitute to help teach the class 
 Option 1: The chair broke and she fell on her tail bone. 
 Option 2: The chair broke and she fell but was okay.