TASK DEFINITION: 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.
PROBLEM: original sentence: Sara borrowed the book from the library because she needs it for an article she is working on . She reads it when she gets home from work . paraphrase: Sara and Julia borrowed books from the library because they need them for articles they are working on . They read them when they get home from work .

SOLUTION: Number

PROBLEM: original sentence: Joe paid the detective after he delivered the final report on the case . paraphrase: The detective was paid by Joe after he delivered the final report on the case .

SOLUTION: Voice

PROBLEM: original sentence: Frank felt vindicated when his longtime rival Bill revealed that he was the winner of the competition . paraphrase: Frank and Steve felt vindicated when their longtime rivals Bill and Pete revealed that they were the winners of the competition .

SOLUTION:
Number