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: Tom gave Ralph a lift to school so he wouldn't have to drive alone . paraphrase: Tom and Bill gave Ralph and Josh a lift to school so they wouldn't have to drive alone .

SOLUTION: Number

PROBLEM: original sentence: Fred was supposed to run the dishwasher , but he put it off , because he wanted to watch TV . But the show turned out to be boring , so he changed his mind and turned it on . paraphrase: Fred is supposed to run the dishwasher , but he is putting it off , because he wants to watch TV . But the show turns out to be boring , so he is changing his mind and turning it on .

SOLUTION: Tense

PROBLEM: original sentence: Sid explained his theory to Mark but he couldn't understand him . paraphrase: Sid is explaining his theory to Mark but he can't understand him .

SOLUTION:
Tense