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.

original sentence: Sam took French classes from Adam , because he was known to speak it fluently . paraphrase: Sam took French classes from Adam , because he was known to speak it fluently .
Voice

original sentence: Adam can't leave work here until Bob arrives to replace him . If Bob had left home for work on time , he would be gone by this time . paraphrase: Adam and John can't leave work here until Bob and Steve arrive to replace them . If Bob and Steve had left home for work on time , they would be gone by this time .
Number

original sentence: I used an old rag to clean the knife , and then I put it in the drawer . paraphrase: I am using an old rag to clean the knife , and then I am putting it in the drawer.

Tense