instruction:
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.
question:
original sentence: Bob paid for Charlie's college education . He is very grateful . paraphrase: Jane paid for Anne's college education . She is very grateful .
answer:
Gender


question:
original sentence: Joe paid the detective after he received the final report on the case . paraphrase: Joe is paying the detective after he received the final report on the case .
answer:
Tense


question:
original sentence: I couldn't put the pot on the shelf because it was too tall . paraphrase: I couldn't put the pots on the shelves because they were too tall .
answer:

Number