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问题: He is unlike his father,_____?

是isn't he or is he?

解答:

isn't he
请注意下列规律:
1.当陈述句部分中含有表示否定意义的前缀或后缀(如:un-, in-, im-, dis-,
-less等)的词时,附加问句部分用否定形式。
例如:
They dislike English, don't they? 他们不喜欢英语,不是吗?
That's unfair, isn't it? 那件事不公平,不是吗?
You are too careless, aren't you? 你太粗心了,不是吗?

2.当陈述句部分含有表示否定意义的词(如:no, nothing, nobody, little, few, never, neither, hardly, seldom等)时,附加问句部分则用肯定形式。
例如:
There is little water in the cup, is there? 杯子里几乎没有水,是吗?
They have never seen the film, have they? 他们从未看过这部电影,是吗?