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: Bill passed the half-empty plate to John because he was hungry . paraphrase: Joan passed the half-empty plate to Mary because she was hungry .

SOLUTION: Gender

PROBLEM: original sentence: Bob collapsed on the sidewalk . Soon he saw Carl coming to help . He was very ill . paraphrase: Bob and Henry collapsed on the sidewalk . Soon they saw Carl and Ben coming to help . They were very ill .

SOLUTION: Number

PROBLEM: original sentence: This book introduced Shakespeare to Ovid ; it was a major influence on his writing . paraphrase: This book introduces Shakespeare to Ovid ; it is a major influence on his writing .

SOLUTION:
Tense