Similarly you can say "or can occur adbruptly"

The media widely discusses the possible disconnection of Russian users from the Internet, and many experts are inclined to believe that this can unexpectedly occur

OK Olga, just got back home, so I'll answer your question in detail now. "Can you drive?" does not mean the same as "Are you a driver?" "Can you drive?" can be interpreted in 2 ways: 1) "Can you drive a car," or "Can you drive this car?" - in the sense of whether they are actually able to drive a car 2) If you and the other person you are talking to already understand the context for your question. For example: if you and your partner are driving in a car, and you stop at a red traffic light. Then when the lights go green, you tell him "can you drive" (so that he drives the car) "Are you a driver?" - this can also mean a few things depending on the context. 1) The most common is when you ask someone this, it means, if they are a bus or a taxi driver (but again, depends on the context) 2) "Are you a driver?" can simply mean whether they are a driver of a vehicle, any vehicle, since it's not specific. But it will usually mean a car. To answer your question, which is, if you just want to ask someone whether they know how to drive, just say: "Do you know how to drive a car?" / or similarly "Are you able to drive this car?" "Are you a singer?" This almost always means "are you a professional singer?" I hope this helps.

Ill answer the second part later but the amswer to your first question is this: it means the same thing and people say both interchangably. More common to say 'are you a good swimmer' though

edit: on second thought, use the first one. "Good" is more precise in this context.

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Im confused. You asked this on Italki? Lol