I don't think your brother is at home ,____ ____ (反义疑问句?）

is he
主语是第一人称的，根据宾语从句来反。
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is he?
参考：
否定意义的词
　　否定意义的词 　　（1）当陈述部分有never，seldom, hardly，few，little，barely, scarcely, nothing，none,rarely 等否定意义的词汇时，后面的反意疑问句则为肯定形式： 　　There are few apples in the basket, are there? 　　He can hardly swim, can he? 　　They seldom come late, do they? 　　（2）当陈述部分含有否定意思的词是unhappy,dislike,unfriendly等含有否定词缀的派生词，也就是有un-前缀、-less后缀等含有词缀而意思否定的词，当做肯定句处理，疑问部分要用否定形式。如： 　　He looks unhappy,doesn't he?他看上去不高兴，不是吗？ 　　The girl dislikes history,doesn't she?这女孩不喜欢历史，不是吗？有less,fewer等词视为肯定词，疑问部分用否定形式。如：　There will be less pollution, won't there?
表示主语主观意愿的词
　　含有think, believe, suppose, imagine, expect等动词后接宾语从句构成的主从复合句在构成反意疑问句时，视情况不同有两种不同的构成方式。 　　(1.)当主句的主语为第一人称时，其后的简短问句应与从句相一致。例如： 　　I expect our English teacher will be back this weekend, won't she/he? 　　We suppose you have finished the project, haven't you? 　　值得注意的是，当这些动词后接的宾语从句的否定转移到主句时，其仍属否定句，故其后的简短问句应用肯定式，而非否定式。例如： 　　I don't believe that he can translate this book, can he? 　　We don't imagine the twins have arrived, have they? 　　此类句子的回答同"前否后肯"型反意疑问句一样，如上述后一个句子，若双胞胎已经到了，则回答为"Yes, they have."；若尚未到达，使用"No, they haven't."。 　　(2).当主句的主语为第二、三人称时，其后的简短问句则应与主句相一致（此时，否定只看主句，与从句无关...）。例如： 　　Your sister supposes she needs no help, doesn't she? 　　You thought they could have completed the project, didn't you? 　　They don't believe she's an engineer, do they? 　　She doesn't expect that we are coming so soon, does she? 　　(3)但如果主句的时态是过去时等等，疑问句应和主句的人称时态保持一致。
had better或have
　　陈述部分有had better,或其中的have表示完成时态时，疑问句应用hadn’t等开头： 　　You’d better get up early, hadn’t you? 　　其他情况句中有have时疑问句应用don't等开头 　　如have表示“有”的时候，有两种形式：（have 表示有 可用do或 have来改写） 　　-He has two sisters,doesn't he? =He has two sisters,hasn't he? 　　-He doesn't have any sisters,does he?

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