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.

[Q]: original sentence: The man couldn't lift his son because he was so weak . paraphrase: The man can't lift his son because he is so weak .
[A]: Tense


[Q]: original sentence: Bob collapsed on the sidewalk . Soon he saw Carl coming to help . He was very concerned . paraphrase: Bob collapsed on the sidewalk . Soon Carl was seen coming to help . He was very concerned .
[A]: Voice


[Q]: original sentence: Bob paid for Charlie's college education , but now Charlie acts as though it never happened . He is very ungrateful . paraphrase: Jane paid for Anne's college education , but now Anne acts as though it never happened . She is very ungrateful .
[A]:
Gender