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: The scientists are studying three species of fish that have recently been found living in the Indian Ocean . They appeared two years ago . paraphrase: the biologists are studying three species of aquatic vertebrates that have recently been found living in the indian ocean . they appeared two years ago .

SOLUTION: Synonym

PROBLEM: original sentence: The woman held the girl against her chest . paraphrase: The girl was held by the woman against her chest .

SOLUTION: Voice

PROBLEM: original sentence: Sam Goodman's biography of the Spartan general Xenophanes conveys a vivid sense of the difficulties he faced in his research . paraphrase: A vivid sense of the difficulties he faced in his research is conveyed by Sam Goodman's biography of the Spartan general Xenophanes .

SOLUTION:
Voice