Question tags — “did you” vs. “didn’t you”
- People can hardly motivate themselves now, can they?
- People can hardly motivate themselves now, can't they?
Number 1 is the correct answer. However, usage of can't they in number 2 can also be correct as it takes the tag question format but due to now being used in the sentence, it is wrong.
My question is, I am too sure that number 1 is the correct answer, but I am not sure about the above explanation. How true this holds? And why the addition of the adverb "now" makes number 2 incorrect?