"Can I get a fork?"
Not accepted for me on January 20, 2019. I have reported it. I would say that "a fork" is not exactly the same as "one fork", so the given answer is not correct and only "fork kudasai" should be accepted. I am not a native English speaker so please correct me if I am wrong.
Yes exactly. Its one of the many many counters which are used when counting things and they are all oddly specific, like one for round things, long thin things, etc... you just have to remember each one because...well... moslty because Japanese is super complex sometimes... Lol