11. The underlined part is the subject of the sentence: "The documents are already sent by the manager." 12. In the sentence, "Clams are considered a delicacy by many people", the underlined word is the be-verb. 13. To change from passive to active, find the subject in a "bythe..." phrase, or consider carefully who or what is performing the action expressed in the verb. Make that agent the subject of the sentence and change the verb accordingly. 14. "Belinda mailed the letter". When this sentence is changed into the passive voice, the subject of the sentence will be the word letter. 15. "The professor left the big green apples on the table." When this sentence is changed into the passive voice, the sentence will be: "The big, green apples were left on the table aby the professor."​