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: Joe's uncle can still beat him at tennis , even though he is 30 years younger . paraphrase: Joe and David's uncles can still beat them at tennis , even though they are 30 years younger .

SOLUTION: Number

PROBLEM: original sentence: There is a gap in the wall . You can see the garden behind it . paraphrase: there is a hole in the partition . you can see the garden behind it .

SOLUTION: Synonym

PROBLEM: original sentence: I poured water from the bottle into the cup until it was empty . paraphrase: I am pouring water from the bottle into the cup until it is empty .

SOLUTION:
Tense