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: John couldn't see the stage with Billy in front of him because he is so tall . paraphrase: John and Harry couldn't see the stage with Billy and Jack in front of them because they were so tall .

SOLUTION: Number

PROBLEM: original sentence: The path to the lake was blocked , so we couldn't reach it . paraphrase: The path to the lake is blocked , so we can't reach it .

SOLUTION:
Tense