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: We went to the lake , because a shark had been seen at the ocean beach , so it was a dangerous place to swim . paraphrase: The lake was gone to by us , because a shark had been seen at the ocean beach , so it was a dangerous place to swim .

SOLUTION: Voice

PROBLEM: original sentence: They broadcast an announcement , but a subway came into the station and I couldn't hear it . paraphrase: They broadcast announcements , but subways came into the station and I couldn't hear them .

SOLUTION: Number

PROBLEM: original sentence: The sun was covered by a thick cloud all morning , but luckily , by the time the picnic started , it was gone . paraphrase: the sun was covered by a thick fog all morning , but luckily , by the time the picnic started , it was gone .

SOLUTION:
Synonym