Sentence 1: My husband is an excavator. 
 Sentence 3: When my son was only 5 he was able to drive a backhoe 
 Sentence 4:  He now mows our lawn with a full size tractor 
 Sentence 5:  He has gotten a lot of confidence because of this 
 Given Sentence 2: He owns many pieces of heavy equipment and large lawn mowers.