instruction:
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.
question:
original sentence: Look ! There is a shark swimming right below that duck ! It had better get away to safety fast ! paraphrase: Look ! That duck is being swum right below by a shark ! It had better get away to safety fast !
answer:
Voice


question:
original sentence: Joe's uncle can still beat him at tennis , even though he is 30 years older . paraphrase: pim's uncle can still beat him at tennis , even though he is 30 years older .
answer:
Synonym


question:
original sentence: I used an old rag to clean the knife , and then I put it in the trash . paraphrase: I used old rags to clean the knives , and then I put them in the trash .
answer:

Number