>you can't jailbreak "an" Apple You can, because any fluent English speaker will understand that you are referring to some type of mobile phone or tablet devic

>you can't jailbreak "an" Apple You can, because any fluent English speaker will understand that you are referring to some type of mobile phone or tablet device manufactured by Apple (which implicitly excludes Macbook, iMac, etc. devices that do not need to be jailbroken). It is not necessary to specify exact model numbers and so on. Keep in mind the source material was a tweet and not a media release or technical documentation where that level of detail would be appropriate. The use of colloquialisms is fine in casual communication. > and you can't order "a" McDonald's. Because no one would say "I'm going to order a McDonald's" without specifying some particular item. But if you are ordering McDonald's in general you would drop the "a", e.g. if you were with a group of people you might say "I'm ordering McDonald's, does anyone want anything?", you wouldn't say "I'm ordering a McDonald's cheeseburger, does anyone want anything?" as it is far more clumsy and the other people involved will neither care or need to know about what you are ordering for yourself. Out of curiosity, is English an acquired language for you? I have seen ESL speakers with similar problems when informal / day-to-day use of the language differs from the more formal version they were taught.