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: In the storm , the tree fell down and crashed through the roof of my house . Now , I have to get it removed . paraphrase: In the storm , the roof of my house was crashed through by the tree which fell down . Now , I have to get it removed .

SOLUTION: Voice

PROBLEM: original sentence: Sara borrowed the book from the library because she needs it for an article she is working on . She reads it when she gets home from work . paraphrase: The book was borrowed by Sara from the library because she needs it for an article she is working on . It is read by her when she gets home from work .

SOLUTION: Voice

PROBLEM: original sentence: Frank was upset with Tom because the toaster he had bought from him didn't work . paraphrase: Frank is upset with Tom because the toaster he is buying from him doesn't work .

SOLUTION:
Tense