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: Frank was upset with Tom because the toaster he had bought from him didn't work . paraphrase: Elizabeth was upset with Mary because the toaster she had bought from her didn't work .

SOLUTION: Gender

PROBLEM: original sentence: The actress used to be named Terpsichore , but she changed it to Tina a few years ago , because she figured it was too hard to pronounce . paraphrase: The actor used to be named Jacchus , but he changed it to Jake a few years ago , because he figured it was too hard to pronounce .

SOLUTION: Gender

PROBLEM: original sentence: Bob paid for Charlie's college education . He is very generous . paraphrase: Charlie's college education was paid for by Bob . He is very generous .

SOLUTION:
Voice