13．Jack is a good boy，isn't （be） he？

分析 杰克是一個(gè)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(dòng)詞時(shí)態(tài)和動(dòng)詞性質(zhì)應(yīng)保持一致，故前面是is，故后面仍然是is，加上否定not構(gòu)成isn't，用he代替Jack做主語，故答案是isn't

點(diǎn)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(shí)或觀點(diǎn)提出疑問，起證實(shí)作用，一般用于證實(shí)說話者所說的事實(shí)或觀點(diǎn)．翻譯為"是嗎"反意疑問句中問句部分的動(dòng)詞與陳述部分的動(dòng)詞在語氣上成相反的對應(yīng)關(guān)系，即：肯定+否定？否定+肯定？當(dāng)陳述句中含有be動(dòng)詞，助動(dòng)詞，或是情態(tài)動(dòng)詞時(shí)，反問句部分由這些詞加上主語人稱代詞構(gòu)成，當(dāng)陳述句中只含有行為動(dòng)詞時(shí)，若動(dòng)詞加了s，就用does，若動(dòng)詞為原形，就用do，動(dòng)詞為過去式，則用did．

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