He hardly exercises, does he?
hardly 几乎不,表示否定,所以后面的反意问句部分要用肯定.exercises表示是一般现在时,主语第三人称单数,所以要用助动词does
表示否定的词还有:seldom, few, little, never, nothing, no, not, nobody等.
There is little milk in the bottle, is there?
There is a little milk in the bottle, isn't there?
另外:unhappy, impossible等词并不表示否定
He is unhappy, isn't he?
He is not happy, is he?
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