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: They broadcast an announcement , but a subway came into the station and I couldn't hear over it . paraphrase: they broadcast a message, but a metro came into the station and i couldn't hear over it .

SOLUTION: Synonym

PROBLEM: original sentence: Since it was raining , I carried the newspaper over my backpack to keep it dry . paraphrase: Since it was raining , the newspaper was carried over my backpack to keep it dry .

SOLUTION: Voice

PROBLEM: original sentence: Pete envies Martin because he is very successful . paraphrase: Pete really envies Martin because he is very successful .

SOLUTION:
Adverb