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: There is a pillar between me and the stage , and I can't see around it . paraphrase: There unfortunately is a pillar between me and the stage , and I can't see around it .

SOLUTION: Adverb

PROBLEM: original sentence: I can't cut that tree down with that axe ; it is too small . paraphrase: I couldn't cut that tree down with that axe ; it was too small .

SOLUTION: Tense

PROBLEM: original sentence: Three species of fish that have recently been found living in the Indian Ocean are being studied by scientists . They began two years ago . paraphrase: three species of aquatic vertebrates that have recently been found living in the indian ocean are being studied by biologists . they began two years ago .

SOLUTION:
Synonym