I'm very confused about these two phrases...
Whenever I'd ask him a question about the grass, he'd look at me as if I was a genius.
Whenever I asked him a question about the grass, he looked at me as if I was a genius.
My first instinct is to say that they're both correct, but are used differently, but my peers on a Swedish forum insist that the first sentence is grammatically incorrect because of the use of would ('d).
So, I need some help understanding this. Why is the first sentence incorrect? If it's not, then why is that? What's the difference between them?
(: