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5．Is this her book？（作否定回答） No，it isn't．．

分析這是她的書嗎？
不，不是的．

解答答案：it isn't．原句是一般現在時的一般疑問句，否定回答用No，主語+be+not，主語this用it代替，故isn't，故答案是it isn't．

點評一般疑問句肯定回答：Yes，主語+一般疑問句開頭的那個單詞．否定回答：No，主語+一般疑問句開頭的單詞和not．要注意人稱的變化

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