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: John was doing research in the library when he heard a man humming and whistling . He was very annoyed . paraphrase: Mary was doing research in the library when she heard a woman humming and whistling . She was very annoyed .

SOLUTION: Gender

PROBLEM: original sentence: Jane knocked on Susan's door but she did not get an answer . paraphrase: suzy knocked on blaire's door but she did not get an answer .

SOLUTION: Synonym

PROBLEM: original sentence: Sam took French classes from Adam , because he was eager to speak it fluently . paraphrase: Jane took French classes from Lucy , because she was eager to speak it fluently .

SOLUTION:
Gender