Sentence 1: Chris has always wanted to learn sign language. 
 Sentence 3: Normally Chris writes down when he communicates with them 
 Sentence 4:  However over the summer Chris took on online course on sign language 
 Sentence 5:  Now he communicates with his coworkers faster and perfectly! 
 Given Sentence 2: There are a few people at Chris's job who are hearing impaired.