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 threw his schoolbag down to Ray after he reached the top of the stairs . paraphrase: Julia threw her schoolbag down to Anna after she reached the top of the stairs .

Answer: Gender


Question: original sentence: Tom gave Ralph a lift to school so he wouldn't have to walk . paraphrase: Tom and Bill gave Ralph and Josh a lift to school so they wouldn't have to walk .

Answer: Number


Question: original sentence: This book introduced Shakespeare to Goethe ; it was a fine selection of his writing . paraphrase: This book introduces Shakespeare to Goethe ; it is a fine selection of his writing .

Answer:
Tense