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 older . paraphrase: Lucy's aunt can still beat her at tennis , even though she is 30 years older .

SOLUTION: Gender

PROBLEM: original sentence: The drain is clogged with hair . It has to be removed . paraphrase: The drain is completely clogged with hair . It has to be removed .

SOLUTION: Adverb

PROBLEM: original sentence: I was trying to open the lock with the key , but someone had filled the keyhole with chewing gum , and I couldn't get it in . paraphrase: I was trying to open the lock with the key , but the keyhole had been filled with chewing gum by someone , and I couldn't get it in .

SOLUTION:
Voice