Question

negative sentence + positive tag​

Answer 1

Explanation:

Usually if the main clause is positive, the question tag is negative, and if the main clause is negative, it's positive. For example: It's cold (positive), isn't it (negative)? And: It isn't cold (negative), is it (positive)? If the main clause has an auxiliary verb in it, you use the same verb in the tag question.

Answer 2

$= \: human \: beings$