13．Jack is a good boy，isn't （be） he？

分析 杰克是一個號男孩，不是嗎？

解答 答案：isn't．這里是考查反義疑問句，其主要形式：前肯后否，前否后肯．本句中前面的陳述句是肯定句，故后面的疑問句是否定．陳述部分與疑問部分的動詞時態(tài)和動詞性質(zhì)應保持一致，故前面是is，故后面仍然是is，加上否定not構成isn't，用he代替Jack做主語，故答案是isn't

點評 英語中，反意疑問句是由陳述句和附在其后的附加疑問句組成．其中附加疑問句是對陳述句所說的事實或觀點提出疑問，起證實作用，一般用于證實說話者所說的事實或觀點．翻譯為"是嗎"反意疑問句中問句部分的動詞與陳述部分的動詞在語氣上成相反的對應關系，即：肯定+否定？否定+肯定？當陳述句中含有be動詞，助動詞，或是情態(tài)動詞時，反問句部分由這些詞加上主語人稱代詞構成，當陳述句中只含有行為動詞時，若動詞加了s，就用does，若動詞為原形，就用do，動詞為過去式，則用did．

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