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: Carol believed that Rebecca suspected that she had stolen the watch . paraphrase: Carol and Julia believed that Rebecca and Nancy suspected that they had stolen the watch .

SOLUTION: Number

PROBLEM: original sentence: We went to the lake , because a shark had been seen at the ocean beach , so it was a safer place to swim . paraphrase: We hurriedly went to the lake , because a shark had been seen at the ocean beach , so it was a safer place to swim .

SOLUTION: Adverb

PROBLEM: original sentence: The dog chased the cat , which ran up a tree . It waited at the bottom . paraphrase: The dogs chased the cats , which ran up a tree . They waited at the bottom .

SOLUTION:
Number