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: Pete envies Martin although he is very successful . paraphrase: Martin is envied by Pete although he is very successful .

SOLUTION: Voice

PROBLEM: original sentence: I saw Jim yelling at some guy in a military uniform with a huge red beard . I don't know who he was , but he looked very unhappy . paraphrase: i saw julio yelling at some man in a military uniform with a huge red beard . i don't know who he was , but he looked very unhappy .

SOLUTION: Synonym

PROBLEM: original sentence: Tom gave Ralph a lift to school so he wouldn't have to walk . paraphrase: Tom and Bill gave Ralph and Josh a lift to school so they wouldn't have to walk .

SOLUTION:
Number