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.
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Question: original sentence: Adam can't leave work here until Bob arrives to replace him . If Bob had left home for work on time , he would be gone by this time . paraphrase: lance can't leave work here until rob arrives to replace him . if rob had left home for work on time , he would be gone by this time .

Answer: Synonym


Question: original sentence: When Tommy dropped his ice cream , Timmy giggled , so father gave him a stern look . paraphrase: when jan dropped his ice cream , jon giggled , so father gave him a stern look .

Answer: Synonym


Question: original sentence: This morning , Joey built a sand castle on the beach , and put a toy flag in the highest tower , but this afternoon the wind knocked it down . paraphrase: This morning , a sand castle was built on the beach by Joey , and a toy flag put in the highest tower , but this afternoon it was knocked down by the wind .

Answer:
Voice