You will be given two sentences. One of them is created by paraphrasing the original one, with changes on an aspect, or using synonyms. Your task is to decide what is the difference between two sentences. Types of change are explained below:
 Tense: The verbs in the sentence are changed in tense.
Number: Plural nouns, verbs and pronouns are changed into single ones or the other way around.
Voice: If the verbs are in active voice, they're changed to passive or the other way around.
Adverb: The paraphrase has one adverb or more than the original sentence.
Gender: The paraphrase differs from the original sentence in the gender of the names and pronouns.
Synonym: Some words or phrases of the original sentence are replaced with synonym words or phrases. Changes in the names of people are also considered a synonym change. Classify your answers into Tense, Number, Voice, Adverb, Gender, and Synonym.
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Question: original sentence: Bill passed the half-empty plate to John because he was hungry . paraphrase: The half-empty plate was passed by Bill to John because he was hungry .

Answer: Voice


Question: original sentence: At the Loebner competition the judges couldn't figure out which respondents were the chatbots because they were so stupid . paraphrase: At the Loebner competition the judges can't figure out which respondents are the chatbots because they are so stupid .

Answer: Tense


Question: original sentence: It was a summer afternoon , and the dog was sitting in the middle of the lawn . After a while , it got up and moved to a spot under the tree , because it was hot . paraphrase: It was a summer afternoon , and the lawn was sat in the middle of by the dog . After a while , it got up and moved to a spot under the tree , because it was hot .

Answer:
Voice