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: John promised Bill to leave , so an hour later he left . paraphrase: John and Peter promised Bill and Steven to leave , so an hour later they left .

SOLUTION: Number

PROBLEM: original sentence: Grace was happy to trade me her sweater for my jacket . She thinks it looks great on her . paraphrase: Grace is happy to trade me her sweater for my jacket . She thinks it looks great on her .

SOLUTION: Tense

PROBLEM: original sentence: It was a summer afternoon , and the dog was sitting in the middle of the lawn . After a while , it got up and moved to a spot under the tree , because it was cooler . paraphrase: it was a summer afternoon , and the canine was sitting in the middle of the lawn . after a while , it got up and moved to a spot under the bush , because it was cooler .

SOLUTION:
Synonym