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.
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Question: original sentence: Tom gave Ralph a lift to school so he wouldn't have to drive alone . paraphrase: Tom always gave Ralph a lift to school so he wouldn't have to drive alone .

Answer: Adverb


Question: original sentence: John was doing research in the library when he heard a man humming and whistling . He was very annoyed . paraphrase: John is doing research in the library when he hears a man humming and whistling . He is very annoyed .

Answer: Tense


Question: original sentence: Joe has sold his house and bought a new one a few miles away . He will be moving out of it on Thursday . paraphrase: The house has been sold by Joe and a new one a few miles away has been bought . It will be moved out of by him on Thursday .

Answer:
Voice