My friend write a paragraph which have a setence on: " Fronzen film is adapted from a fairy tale and so does Tangled film." But I think we metion "fairy tale" in general meaning, so we must write "from fairy tales" instead of "from a fairy tale". That like the sentence: " Cats are cute". We mention "cat" in general meaning, so we must use "cats" instead of "cat". And you, what do you think? What should we use?